Had viral fever recently but now its good after the treatment but now i have ulcers all over my mouth and throat what to do?

See doctor ASAP: Several allergic conditions and viral infections can do this. Newly acquired herpes is possible, also coxsackie virus and others. If you also have a skin rash, perhaps Stevens Johns syndrome. Some of these could be serious; return ASAP to the doctor who has been treating you.

Mouth and throat: You need to be referred to an Ear, Nose, and Throat specialist. Your doctor will refer you!