This doesn't sound at all like herpes, and herpes wouldn't affect your arms and waist. Have you seen a doctor? You could be having an allergic reaction to something, dermatitis, eczema, a fungal infection, or a long list of other things, and herpes would be way down my list of possibilities. It could all be totally unrelated to your sexual activities.
There is something called burning mouth syndrome that you should google - it's an allergic reaction.
If you get a type specific IgG herpes test, it shouldn't react to any other antibodies. Don't get an IgM test - that might react to chicken pox antibodies.
Just go see your doctor and get some help. Even if it is herpes, not getting seen by a doctor won't make it go away. I really don't think it's herpes, and if it isn't, you've wasted a lot of time suffering in fear.
Let me know what the doctor says.
One more question.. do herpes test can respond to any other antibodies in the body giving false positives?