With your symptoms it seems like oral submucous fibrosis with intraoral lesions. Sometimes these lesions may heal with medicine and proper treatment... So don't panic.
For more details about Fibrosis go through link..
https://www.practo.com/healthfeed/oral-submucous-fibrosis-dental-disease-39449/post
Next Steps
take endepth consultation with oral surgeon ..with modern day treatment can be cured.
Health Tips
oral submucous fibrosis is very painstaking and chronic condition.. so keep patience and faith in your doctor.