It's Oct, 2013 so don't know if you guys are still following this thread. I'm a healthy female, mid-30's, who started experiencing these symptoms to a T this past May.
I have been for the same tests with the same results as Throatgrind. Ultrasound, x-ray, blood work, scope, dentist, chiro, manual exam - everything is fine but dentist and ENT believe swallowing/frog-in-throat issues are a result of reflux. Coinciding with the onset of these symptoms was the "crepitus" feeling of clicking and misalignment in my throat/neck- usually just a strange sensation, other times uncomfortable and occasionally painful.
Tecta (an antacid) helped with the swallowing/frog-in-throat sensation but has, of course, done nothing for the crepitus feeling which, according to my doctors is normal, just that I am more acutely aware of it than most.
I believe that had I not developed the reflux issue which caused excess mucous and difficulty swallowing I would not have become so aware of the crepitus thing. Anyhow, with one under control and my mind at ease that all is normal, I am going to try to find a way to reduce the crepitus feeling.
I have had some improvement with chiro, and believe that strengthening the muscles in the neck area may help to keep things 'on track'.
Throatgrind - put your mind at ease with a simple blood test for thyroid levels. Also, good quality organic Turmeric capsules from a proper health food store are an excellent anti-inflammatory and can help everything from arthritis pain to generalized internal inflammation.