I know ur std tests were all neg but make sure they do a bloodtest for both hsv-1 (oral herpes) & hsv-2 (genital herpes). Typically they do not test u for both in an std screening.Generally speaking, the two types stick to their own areas but u could have hsv-1 on ur genitals.
Main thing is to just stop stressing urself out so much about it bc stress is what brings it on even worse. No matter what it actually is, upsetting urself wont help. Ask your doc for a full std blood workup, tell him to test u for both hsv types.
The beard thing makes sense, I thought the same thing. Just get retested & try & relax about it untill u find out 4sure. Wear cotton panty's, they wick any moister which only make things much worse. Try softer toilet paper too, and only use hypoallergenic feminine products. That includes any lubes or oils u may have for sex.