A surgical procedure to make the opening of the vagina bigger could be helpful if it is currently physically blocking your ability to dilate. We often need to cut the hymenal ring during our botox procedures to make the introius larger for the bigger dilators to be inserted. Many women have thick small hymenal rings, and that makes it even more difficult to dilate.
The surgery will not make the muscle tension any better. But if part of your issue is a physcial barrier at the entrance, then opening that up, might make dilation easier, and then you can more effectively treat the muscles.
You sound like a good candidate for the Botox procedure. If you want to talk to someone about that, give us a call!