101 wouldn’t cause me to go to the doctor unless I had additional symptoms that made me think I needed a doctor’s attention.
Sore throat with fever? Yes, I would get a strep culture. Cough, achy, and barely able to move out of bed? I’d take three ibuprofen with a glass of water, a few crackers, and go to bed. I’d do that every 6 hours along with some food here and there, soup, soda, for four days, and by then it usually let’s up a little (assuming it’s the flu). If the three ibuprofen don’t work alone I add a Tylenol and use cold wet compresses to cool my forehead, arms, , stomach, and thighs until the drugs luck in. It takes about 45–50 minutes for the drugs to bring down a fever.
When I have the flu or strep my fever usually reaches 103 if I do nothing, it can go higher.
However, you say you are dizzy and you took a decongestant? Is that right? Or, am I translating those drugs wrong? Congestion and fever along with dizziness is a bacterial sinus infection probably. That needs a doctor to prescribe antibiotics if it doesn’t get better within a few days. The flu, and strep for that matter, almost never has congestion.
If I suddenly felt much worse I’d go straight to the ER. A sudden downturn like trouble breathing, uncontrollable fever 104 and up, or just a general feeling something is extremely wrong should not be played with.
That’s what I do. I’m not a doctor, that’s not medical advice. It is impossible for me or anyone here to evaluate you.