IUI so much pain and pressure.

I had an IUI done yesterday morning, clomid and IUI. I felt great till about 7 p.m. then I felt like I was going to pass out. The pain was awful! It's a pain I can't even explain and I already have to kids. It was nothing like labor pain. It was like someone was in there twisting my ovaries all around. This morning I feel better still pain when I walk or going from sitting to standing position. Now I am just praying this one takes because OMG I don't want to go through that pain again. I am posting this because I read up on IUI and it sounded so pain free. Anyone else had this kind of pain after an IUI?