hello i can understand your concern.... well the description given by you clearly indicates that you have developed a condition called as SHINGLES i.e a viral infection known as herpes zoster infection....you dont need to worry but the key points to take care here is time i.e dont wait as early diagnosis and early initiation of treatment by a antiviral drug called as TABLET ACYCLOVIR is the key to the final outcome and time taken to resolve the condition....you should visit a dermatologist asap....diagnosis is made by---- (1) just by looking at visible lesions a experienced dermatologist can easily confirm the diagnosis by just looking at the lesions (2) another way of making diagnose is preparing TZANK smear from the lesions made from lesion and visualised under microscope to confirm (3) blood test includes detection of IGM Antibodies agains the causative virus (4) some other highly sensitive tests r also available but these r usually not required as diagnosis is mainly clinical Treatment---- antiviral drug ACYCLOVIR should be started orally witin 72 hours of the appearance of the first lesions/rashes....along with this some analgesics and topical creams are also used for pain n unpleasent sensation i hope with all the relevent information i have provided u above,you should waste no more time n move immedietly to a good dermatologist for initiating the things.... all the very best n dont worry you will be very well soon....god bless u regards.....