The best thing to do would be to see a health care professional who could see what is going on. I know it can be a tough time when you don’t know what is going on and the area is so sore.
It sounds like the area is very sore and there are a number of things that could cause this. For example it could be a yeast infection, urinary tract infection, herpes outbreak etc…
The health care person could probably give you a good idea by just looking at it.
It is possible your boyfriend could have passed the herpes (cold sore) virus to your genital when performing oral sex.
A health professional like a doctor or nurse would need to keep all your information confidential which means they would not share it with anyone else without your permission.
Have a look at our clinic finder for a clinic in your area.
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