Go to a doctor immediately and get FULL blood work completed with an emphasis on your immune system. Of course, tell them exaclty what is happening.
It sounds like you have a compromised immune system for some reason.
If everything tests well, goto a good naturopathic doc and tell him about your situation and he will most likely say the same thing I have. There are things that can cause a compromised immune system relating to diet, lifestlyle or even things like Candida.
Sometimes people get herpes who do not realize their immune system is in bad shape. It's a bummer having herpes but it is more or less a 'barometer' of your general health and immunity.
Anyway, I do not mean to scare you but having a full body chicken pox type reaction to genital herpes is NOT NORMAL.
Please get checked out and post your results if you don't mind.