Continuous burning in penis and anus.

Well,i had vaginal sex with my friend for like 10 seconds in 2014, later 14 days i started to feel burning sensation in my penis n anus ,when I seat at office it's burn a lot.i also see very little white spot in my underwear every day..I doubted so i ask her to get tested for hiv.then she had tested Elisa antibody which came negative..and I had tested for urine microscopic and urine culture and sensitive twice with 2 different labs,which came normal..also tried doxycycline,norflox, cipro, secef and azithromycin 1 gm..nothing work's..now I'm married in 2015 december and have 6 months baby.my wife routine for pregnancy test was ok..and I can't stay longer on bed...what it is? Is it weakness? Or something else.please give me best medicine or any advice?.thanks in advanced.please reply.