I have found that stress can cause all kinds of feelings in the throat and neck area. At one time, I had a lot of problems with swallowing and severe post nasal drip in the throat. Turned out it was all stress related - most probably due to health anxiety. I went through similar fears that you are describing of throat or thyroid cancer. Stress can cause us to tighten up and thus, creates all kinds of symptoms in the head, neck and throat area - often related to TMJ. I was surprised to find out all the different symptoms that can result from TMJ. It's hard not to worry about cancer (that's always my big fear), but there are so many other things that can cause what you are describing. I hope that you are able to worry a little less - it's really hard when you have HA, but hope it helps to hear that these things can be stress, TMJ or both combined.