I had a severe bout of health anxiety last year - it was absolutely awful. Specifically, I was worried about the possibility of having cancer; and even with a lot of evidence to the contrary, I could never be convinced that I was perfectly physically healthy. My hypochondria got so bad I began to have horrendous psychosomatic symptoms, and I would just break down in tears randomly.
I hope the meeting with the ENT can calm your fears somewhat. Personally, I never went to the GP, because I said to myself that I'd rather die on my own terms than have to go through chemo and slowly wither away (which I viewed as inevitable, as I was wholly convinced of my illness), but I do wish I had received counselling for it. I feel as though it'd make my current anxiety easier to deal with.