Hi,your sensitivity may be because of chemicals of any drug used by you.it may be because of sub mucous fibrosis
.you should use steroid
oral paste available in madical store.its not a psychological problam.if problam is sevear you can go through some steroid+hyaline injection from your dentist
.it can be dignosed only after oral cavity examinaton.also check is there any white patches present on your tougue. proparly clean your mouth.consult your doctor which medicine is allergic to you,changed that medicine.