Hey dude
I found this question; and I thought I'd share my story with you.... just in case this is still going on for you or anyone else here in particular
Some years ago I had the same problem; didn't know wot it was... Its like my throat just didn't like swallowing. Its crazy. It would be so often that I even got scared of my tongue; because sometimes I would get so frustrated and panicked that I thought I couldn't feel my tongue or if I were going to swallow it or something. I would get REALLY anxious and it would take a lot of time to calm down(by occupying myself with some other activity that made me try to ignore it); and this would happen a lot even at night when I was falling asleep. I would just sort of jolt myself awake and get anxious over my tongue and not being able to swallow spit for my dry throat; and I'd cling to my pillow and bury my face in it, tapping the fabric with my tongue to reassure myself my tongue was still there-then practice swallowing while thinking about other things. It would be so horrible sometimes that I wanted to call out to my mother, from my room.
It STILL does it to this day occasionally; but I think its just some mental thing, something in the back of our heads that became a phobia over some time. This goes for the inability to swallow, as well.
So; if the medical tests don't work; it'll be up to you emotionally. It's PROBABLY an emotional issue; which only YOU can control. Don't think about swallowing. Just do it. I know it sounds difficult as it may be a discharge of a sort in your health; but try your best to ignore it and think of something that makes you feel excited or enthusiastic, deep inside. And just do it. Heck, if it helps, even take a warm bath and relax yourself of all thoughts about it-And don't focus on WHY your doing it, but doing it just because you feel like you want to. It helps me.
I REALLY hope it helps for you too. Seriously; my condolences. I will be hoping for the best of you.
Sarah