Thanks for writing your query.
According to the symptoms you have described it seems that you are having Herpes
There is severe pain/burning sensation in one side only. It is a viral disease.
It will be better if you get yourself examined by a medical proffessional and start the treatment.
Treatment consists of antiviral
drugs like Acyclovir
. Starting the medicine early will shorten the duration of the disease. It usually takes three to four weeks for recovery.
I hope this is helpful to you.