Suggest Remedy For Burning Pain In Vagina During Intercourse

I've been having burning pain during sex with my boyfriend. It hurts during entry, but not during sex with the burning returning for about an hour after sex. I recently just self-treated for a yeast infection caused by antibiotics from a UTI about a month ago. We've only been having sex for about 2 mths and before that I haven't had sex for over 3 years. My boyfriend is also rather large down there. I've never had the problem before and I'm not sure what to do about it.