Hi there! I'm from the UK, and part of the BANA forum, for British sufferers. I havent had my op yet (another story!!) but I have regularly seen posts on BANA from folks who are post op & suffer these kinds of issues. I believe it has something to do with damage to the facial nerve, as this supplies sensations & some taste buds to the tongue. People seem to go for months without any problems, then bam! Suddenly they have burning, soreness, salty tasting sweet & vice versa etc.
I have had these sensations too, even before the op, my tongue & the inside of my lips was red raw & it was really painful to smile! I looked like I was baring my teeth rather than smiling, but it didnt last too long, (about a week if memory serves me correctly - & that's another challenge too - memory! Hah!)
Anyway, I'm no doctor, & simply recounting the previous experiences of others I've seen, but it seems to me that even when the "squatter" is evicted, it still leaves its mark...
Keep smiling xx