Hi, As per your complain ulcers on tongue and throat along with fever and runny nose seems to be most probably due to Viral Infection. I would suggest you to consult an Oral Physician and get evaluated and a thorough clinical evaluation and investigations like blood tests and oral swab culture can help in diagnosis and treatment can be done accordingly. In case of viral infection antiviral medication like Acyclovir is advised. As of now you can take supportive treatment to relieve pain like gargle with numbing mouthwash containing Lignocaine. Do warm saline gargles. You can take anti inflammatory painkiller like Ibuprofen. Avoid spicy and hard foods. Take a soft and bland diet. You can also suck ice and do cool water rinses. A painkiller injection like Voveran can help in reducing pain and inflammation. Hope I have answered your query. Let me know if I can assist you further. Regards, Dr. Honey Arora