I am having the same problem at the moment, I went to a doctor yesterday, he said I am fighting off an infection. Most likely a sinus infection, which will cause pain there. So every time I swallow there is a pain there, and also a sense of dryness. I have also being feeling sick, headache, top of my mouth dry and hurts to swallow, dizziness, but I am still hungry. I haven't tried anything yet, I might dry gargling salt water, I tried mints they didn't do much, maybe try drinking alot of water and liquids, fruits like oranges and bananas. That's all I have got hope it helps!
Hey i suggest you check this link out.... http://www.ultrunr.com/drymouth.html goodluck..
I am not really sure what this is, but it may be related to the dry mouth. I would suggest that you see an oral surgeon for a definitive diagnosis.