So first off I'm 16 (if that's important) and I've had severe anxiety my whole life. But I think I need answers rather than just comfort right now. During this year I've been having some weird symptoms. I noticed a couple lumps in the back of my head back in around January (I think). One is much bigger. I think its about an inch long and half an inch wide right now and I can't say for certain but I think it's grown. The other one is pea-size (maybe a little bigger) and irregular. Both are fixed and for the most part aren't painful, although I do get sick pretty often and whenever I do they get sore, like lymph nodes do, so I'm assuming they're lymph nodes. In April I noticed that my stomach was rock solid when I pressed on it while it was completely relaxed. It hurt but only when I pressed on it.

Ok so in July I started to get regular stomach pains in the same place, which is the center of my stomach. Nothing too bad but it's really annoying and it came out of nowhere. In August though, I started to get constipated out of nowhere. Fiber one worked for awhile but after a week it just started making my stomach hurt more than anything. A few weeks later I noticed that I have a hard, painful lump in my abdomen. Now here we are in October and I'm still having stomach pains and constipation on a regular basis and I'm so tired of all of it. I've been to the doctor 4 or 5 times and it's literally been no help.

Some other symptoms I've had:

unintentional weight loss of about 15 pounds
rashes
extreme fatigue
shortness of breath
so much sweating!!!
constant joint/bone pain

I got a blood test a few months ago and I was negative in everything (including cancer) so could that be a mistake? Does cancer seem likely? If not what could be causing all of my symptoms?

Oh and sorry if this is hard to follow or anything. It's really late and I'm tired but thank you sooo much to anyone who did read it.