Oh, and also, make sure your BF showers and thoroughly washes his hands before intimacy. It's a small price to pay. You may have a latex allergy, also, so use latex-free condoms only. Keep some in your purse.
Get Azo Yeast at the drug store and follow directions. It is in the yeast medicine section next to the feminine hygeine products.
Here is a whole page on home remedies and how people did it. I have used soaps containing tea tree oil just routinely after intercourse. Some people seem to be describing using pure tea tree oil, but honestly some people could get irritation because it's strong, so I can't say if you will have good results or terrible burning. Another one I've used is boric acid.
http://www.myhomeremedies.com/static/yeast-infections.html
Could just be from the irritation from the condom, like you already stated, sometimes it hurts you. Could also be from the sex bring too rough, you could have a yeast infection which can sometimes cause burning down there, or you could have a UTI.