This must sound like a strange complaint, but sometimes when I swallow it actually feels like I'm swallowing my tongue, then it pops back, almost like there was a bubble IN the back of my tongue. I could also describe it as a clicking feeling in the throat/back of my tongue when I swallow. It doesn't happen all the time, just once or twice a day, and sometimes it's hard to swallow even when I don't get the 'tongue swallowing' sensation.
I'm really terrified it might be a tumour or something in my throat.