Doryx side effects

I just received the prescription today- very little information given by the doctor- so I looked up some information and found this site. I am most worried about side effects and many say this makes acne worse for up to a month before it gets better or has no result. I am desperate to get something that works- I am 38 years old with some health challenges but acne is controlling my life- its terrible. I am not on medication now -other than Duac Topical Gel and Retin A Micro for Acne- but I am seeing next month a reheumatalogist next month for RA ( has also gotten very bad in the past two months - Aleve not working anymore - ) also my internist wants to have my thyroid checked again and also an ANA LUPUS test redone- was negative last year but she feels its Lupus.

I had taken Doryx (doxycycline) for acne for about three weeks when I suddenly developed burning "down there"(more towards the urethra) . I stopped the Doryx last week and I was diagnosed with a yeast infection by my doctor and was told to use a 3 day Monistat and take 2 rounds of diflucan. I still have the burning and the gyno doesn't know why and does she not seem to care. It can not be an STD. Did anyone experience this after taking doryx and did it ever go away?