Fully convinced I have tonsil or throat cancer

So I recently noticed my tonsils are uneven and there’s some sort of bump behind my tonsils, this could be completely normal I really have no idea, but I saw a picture of a man with HPV positive throat cancer and I thought it looked exactly like my mouth, my girlfriend doesn’t really see it but I literally thought that it was a picture of my mouth and now I’m fully convinced that I have cancer, I’m 23 and I struggle bad with health anxiety but I’m usually able to tell myself it’s probably nothing, not this time around, I’m an absolute mess. I’m seeing an ENT on Tuesday and I’m scared shitless, I’m shaking and I didn’t know what else to do besides vent.