pain after sex?

So. I've recently become sexually active again after a 3 year relationship ending.
Sometimes, not every time, my vagina hurts so bad after I can't even go to work. I can't hold my bladder and it's a sharp, stabbing pain. It usually doesn't happen until later or even the next day and lasts about three days.  My doctor decided it was probably tearing (he has a beard and is a pretty aggressive pussy-eater) and sent me on my way.
Any advice on how to deal with pain from tearing? 
Trust me. Lube is NOT the problem. 

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