What Causes Severe Pain And Bloating After Intercourse?

I have a hysterectomy in august of 2013, with little issues. It was the robotic kind. I kept the ovaries. All of the issues I had leading up to having this done have disappeared. However, in the last few months, after and sometimes during sex I have a lot of pain. It feels as though my partner "hits" something, then afterwards, I swell up with air, similar to gas but "passing gas" does not make the swelling or pain go away. THe pain is intense, similar to labor pains. This does not occur unless there is penetration.