It seems that you are having HERPES ZOSTER
It is a viral infection.. caused by varicella zoster virus
There may be clusters of vesicles on one side of the body in in zonal way.
There may be severe burning .
There may be deprived immunity.
Antiviral drug like acyclovir for 2 to 3 weeks will improve the disease.
Steroids in tappering dose may be taken to prevent postherpetic neuralgia
Silver sulfadiazinae cream may applied locally.
Avoid stress and worries.
Have healthy food and good sleep.
You will be cured.
But, you may consult dermatologist
Dr.Ilyas Patsl MD