What do you do when your life gets really stressful?

The siblings have their own life?
You too!

So you have a job (a demanding one), a household, a relationship, an e-commerce job at the side, a Maid of Honor-ship, plus you help your parents out.
Hrmmmmm….
That’s very, very much to have going on.
I don’t know you personally, of course, so I might be totally off, but it could be that you have to refocus on prioritizing what you want (to do) and what you need.
What you need.

You (seem to) recognize that your siblings have a life.
Recognize yours.
Recognize you are worth to have a balanced life of yourself.
Maybe ask help in this regard of your partner.

I take time out for a walk in the woods, sometimes a long hike by myself and nature, I photograph interesting views and things while I am in Nature.
As for being too busy with responsibilities I too had done that for years due to an irresponsible husband and father, so I had to pick up the slack etc
I realize now many years later that I had set myself up for stress by taking on things when I knew that I had too much on my plate anyways and I realize that sometimes this is done unconsciously to keep busy in order to not think of my unhappiness in getting or doing what I really wanted in life.
Stop volunteering to do for others instead do for yourself..take a vacation and rethink what it would take for you to be happier?
For me it was reentering School or in this case I upgraded and entered College.
In your case maybe rent out your place and travel abroad to view the world with a wider perspective thereby giving you more to think on what is right for you.
You have cornered yourself and its time to break out.
If need be see a counselor to reset your life.

Go out in the sticks with a gun and shoot the hell out of something.

Come spend three days with me, in my rental home I am too disabled to keep clean. Push me to the bus stop in my wheelchair so I can get to the store and do my shopping. Watch TV while I sit in the basement doing my laundry, then bring it up the steps for me, since I can’t carry stuff up/down stairs.
You come see what stress is, and poof! Your cares will drift away.
You stress because of what if. What if I do bad on a test, what if I stumble and look like a fool at the wedding, what if I do all this work for thing X, and thing X doesn’t pan out?
Enjoy your life, and save the stress for if every single one of your what ifs come to pass, and you end up broken, alone, and living each day in pain.
There is plenty of time for worry eventually. Save it for later.

@Patty I’m sorry. So practice Gratitude. Great advice.

Sorry I could not read your details. I used to sleep in until my situation resolves itself. Now I ask for help from friends and family or from the social safety net. My new trick is to go to dairy queen and having a banana split no toppings extra whip cream and waiting 24 hours before doing any thing impulsive.

Drink.

But, hell, I do that even when it isn’t that stressful but just boring..

Sadly, I eat.

I also try to see the glass as half full. I compare myself to others in much worse situations.

These days though I’m into one of those worst situations myself. Yet, still waking up breathing in the morning and that’s my cue.

I decide to get up. Life goes on. Repeat. Answer Fluther questions.

I told you the dark side of things, so you could see what really can cause worry.

Now, when I realized I was not getting better, and doctors were not helping, I started to get rather blue.
I missed the days when people greeted one another cheerfully, and smiled. I needed smiles in my life, like I needed oxygen.
My daughter was in the early years of primary school at that time. Each day I was hobbling to the school with her, then home, then it seemed I barely caught my breath and I had to head back to the school to pick her up.
I decided this crush of apathy I faced each day in that town has to be trained to new behaviors.
Much to my child’s chagrin, I greeted every single individual I encounter along the way. I smiled my best, and spoke with the sunniest voice I could manage.
At first I was met with the oddest expressions, like people were deciding whether I needed an ambulance.
Eventually, smiles came, and greetings. Most of the children in this school were Hispanic, so some greetings were awkward. I encountered one day an elderly gentleman with probably his little granddaughter. He indicated a desire for me to stop. He spoke no English at all. He urged me to help him master good morning. After that I was seeing him often, and he always cranked the gears, and spoke the best good morning he could manage.
I started seeing babies, one and two years in strollers. When they spotted me their little fingers would pop up and an exuberant “morning” would ring out. One day I was feeling especially proper. I told a little boy, probably first grade, “good morning, sir.” He looked puzzled his mother told him something in Spanish. He walked the rest of the block looking over his shoulder at me. The next day, he greeted me with a big smile, and shoulders squared. I again greeted him as I had before. After that, if he and mommy were across the street when he saw me, he would drag her to my side, so he would not miss his greeting.
Oh man! Did I fill my days with smiles.
The take away to this is, be what you want to get from your environment, and you will get the environment you desire.
Be confident. Leave worry to we sorry suckers who have lots to spend it on. In return you will find new ease from each aspect of your life. Except teenagers. Teens are just temporary aliens from another universe.
Good morning.

Thanks guys. I think sometimes the stress gets to me and I feel really depressed about everything. I need a vacation is what the solution is.

You do (need a vacation).
And after that have a look at your priorities.