I know its easy to get thinking bad thoughts when you are worried about something that you aren't sure of. The thing is that more than likely - you just have a cold or the flu.... but honestly I know how you feel. It is hard to trust doctors opinions 100% espcially if you feel like something is off/wrong.
You are right to be vigilant about your health and getting second and third opinions especially with your risk factors... however don't freak yourelf out about it- just push forward with your appointments and wait to hear what the Drs/ENT say. Demand biopsies scans etc whatever you need to answer any doubts you have in your head- but also don't make yourself miserable and worried about it either. I know that is tough

I was misdiagnosed for several months before I was finally referred to an ENT so I think your being adament about being thorough is a good thing - just don't spiral. Get lots of rest this weekend and just relax-- stress can make you sicker than anything else.
K