First, calm down!!!!! Its highly unlikely you are in the stages of dying at this point. Im not dismissing your symptoms at all. By being upset it does not do one thing to help your situation. In fact, being upset actually makes thing worse, it paralyzes you with fear and that makes it hard to think clearly. All that stress isnt good for your body and your mind is working on overtime with "what if".

It should be some comfort to you that the biopsy came back negative. There are all kinds of things that can produce similar symptoms, like TMJ or wisdom teeth issues, an infected tooth or even a throat infection. You didnt mention if you were a smoker or using tobacco. There are over 50 known cancer causing additives in tobacco. There are many irritants which can cause all kinds of issues in a persons mouth. If you use tobacco in any form, please stop immediately.

I suggest finding an ENT who specializes in oral cancer. Not all ENTs do, so mainly put tubes in kids ears. The rule goes like this, any sore in your mouth that has been there for 2 weeks or longer should be checked by a professional. Only a biopsy will tell for sure exactly what the lump is. Since one was already done, maybe they need to go in and do a deeper biopsy. Since none of us here are doctors with years of medical training or have your whole medical history plus you in front of us, its really hard to say over the internet if any of these doctors have done a truly thorough exam. Unfortunately, being young does not rule out getting an oral cancer diagnosis. We have had a few members here who have been under 23 years old. Finding the right ENT and having a complete check up (possibly including another biopsy) should be enough to ease your mind. I agree with Cheryl, it could be all from the acid reflux. At some point you will have to put your trust in one of the physicians you see. You have seen quite alot of doctors and had a biopsy done so is it possible that all this is simply acid reflux? I would give it one more shot with a ENT associated with a major cancer center and put your faith in them. Hopefully what you are going thru turns out to be nothing as serious as oral cancer.

Good luck!!!