Old 7 year ex or new 6 month BF

I just found out last weekend. I had been on antibiotics for almost a month and thought it was an extremely bad yeast infection until the blisters showed up. The pain is horrible and feels like it will never go away. I am diabetic to top things off which means I heal slower than normal. And to top it all off I don't know who I got it from. I was with my ex for 7 years and have now been with my new boyfriend for 6 months. Neither have ever had the signs that I know of. I don't know what to think or feel anymore. I want to crawl under a rock and never come out. The new bf is being as supportive as possible and hasn't left me or even acted like he will. I feel so dirty. Does the feeling ever go away. Will I ever feel normal again?

Signed,

Absolutely Confused and Depressed