Hmm, I'm not sure exactly what kind of pain you're experiencing but I hope you find some relief. That does not sound fun.

I'm wondering if it's from the suction effect the cup has. When I first used mine and took it out, I didn't break the seal and it felt like I going to turn myself inside out! It was quite unpleasant. Now, like CA, I just make sure to pinch the bottom and start to take it out at a bit of an angle. It even helps to push one side of the wall in with a finger to break the seal. If that makes sense.

Good luck! I hope you find a solution. I had a few bumps in the road with mine, but I absolutely love it now.