Why am I having weird pain and sensations in legs?

Hi, I’m a 20 year old female, I’m not overweight, but petite. Let me just get this out of the way first: I’m very health conscious and have been most of my life, and have always been very physically active. I was diagnosed with RSD at age 11, cured by oxygen therapy and rarely relapse. I was also born 3 months premature. I have kissing knees (what is the correct name for this?i don’t know). I get injured easily (tear muscles, strain muscles) and I had to quit dancing because of this. Few months ago I saw a physical therapist for shin splints (turned out they had healed and I was feeling the chronic pain of RSD).

Ok, are you still with me? Let me get to the leg pain. I’m just curious what this is. Sometimes at night when lying on my side I feel prickly, hot, burning sensations in my thigh (the thigh that I’m lying on) and my thigh will go numb. My circulation gets cut off also if I sit on the floor with both legs straight out in front of me. I can also get feelings of heat on legs, and feet at anytime. And today I suddenly came down with sharp pain in one leg when I take a step. The pain is throughout the whole leg. Didn’t do anything to the leg to injure it, I have had this before and it will be gone by tomorrow. I could go on and on here about weird sensations.

I have had weird unexplainable symptoms my whole life,like if lay on the floor stomach side down for a couple of seconds and when I get up there is pain in my chest for a couple minutes, what the heck is that? I’ve had that since I was 4.

Thanks for your time, this is so long that I don’t really expect any response. I’m just interested in other peoples experiences, knowledge etc.