I know I am going to spell this wrong but Srogren's syndrome does this to your mouth. I get ulcers in my mouth from time to time when I am in a fibro flare.

Have you checked your blood sugar lately? I also get this problem in my mouth from time to time. I am diabetic, so my doctor checked my blood sugar, but it was fine. She said since she'd ruled that out, then it was the Fibro. She told me she could give me a prescription gel to keep my mouth moist, but it wasn't that great and it tasted vile. So now I just sip water and if I'm out I pop a little sugar free sweet ( like a Lifesaver) in my mouth to ease the dryness.

I have had it before but months apart from each other. No new meds. Xx

Is this a new symptom? Or has it been going on for awhile? Have you started any new medications recently?
I've had something similar to the extreme a long time ago and it was an allergic reaction to a medication I was taking! I also recently had a similar situation...but very mild..and I was told it was a side effect of starting Gabapentin...after being on it consistently for 2 months it went away!

I get this as well. I also suffer from dry mouth. I wear a partial n find that I am always pressing my tounge to the roof of my mouth. When not wearing my partial, I feel like my tongue has no room in my mouth.