It's awful, indescribable pain because it makes you feel unreal, if you get what I mean. No sense of taste, no smell, no normal feeling, you just think that the roof of your mouth is literally on fire.
I had it for a few months after a course of strong antibiotics. All I could do was to suck frozen pieces of melon all day long. My doctor gave me a prescription for a thrush treatment but it was useless, my dentist had no answers.
It eventually disappeared after about 3 months. Never again, I hope. Sorry you're suffering, hang in there. 🤞