Has anyone ever felt like this?

I more than likely have some kind of medical condition that at the moment causes rashes such as petechiae and cold urticaria. It also causes moderate to severe joint and muscle pain that has gotten worse really fast. I can’t even really walk around too much without being in pain. It’s gotten to the point where sometimes I’m bedridden. It’s also caused me to have really bad depression. Since things have progressed really fast, it honestly sometimes makes me think that I may die soon. These thoughts came into my head a lot before the progression of whatever is going on and it scared me at the time but now I’m not scared honestly. It actually gives me a bit of peace and comfort knowing I wouldn’t be in pain anymore. And I am seeing a doctor for this but unfortunately every time I have tests done, they come out negative.