Suggest Remedy For Dull Ache And Soreness On Roof Of Mouth

Question : developed a "sore" area, roof of my mouth much like a sinus infection might cause except no infection- almost two years running- visual inspection shows little or no apparent inflammation
symptoms include sensitivity to hot/cold- a dull ache much like a toothache pulsing that encompasses the entire pallet to my ears/sinus- scale of 1 to 10 mostly a 2 but can peak higher.
always there. I've been to a good ENT Dr i trust and was cleared. Went to a neurologist and had an MRI- brain of a 40 yr old, no hard or soft pallet anomalies- thought it might be nerve related- take effexor- limited to no relief. Now the part that makes my Dr give me that it's all in your head look- i would wake up with my tongue pressed against the roof of my mouth, pretty much directly on the area (the boney ridge slightly off center of pallet) and during the day have noted my tongue "twist" 180 degrees and also press against the roof of my mouth- do this without realizing.
all blood work, physical measures say I am in better than average health- no major or minor problems-