Talk to Internal Medicine on Oral Ulcer Might Be Lichen Planus

I have had spice intolerance and limited mouth and tongue opening since i was born And i got use to of it i use to get mouth ulcers all my teenage now cant eat spicy or anything hot i have some condition my dentist says it might be lichen planus (no chaliya tobacco use not at all) i got a tongue ulcer an year back and i has not been healed taking nilstat oral gels nothing working whenever it get better mu tongue cuts it again i got mouth guard its edge also hit on the ulcer spot got my teeth trimmed still they hit it m getting so much anxiety all the time (yellow ulcer hurts alooot,other side only burns) Regular nilstat use calm pain a bit but m not regular with it please help!