Did you talk to your doctor about this already? Under all circumstances you should be getting professional advice as we are talking about a serious condition that involves pain. I did look around the Internet for a while and had a closer look at the drug interactions of Simethicone, which is one of the active ingredients of Gestid. Within the major drug databases, I did not find any indication of major side-effects. The other ingredients should also not interfere.
However, in order to be sure that you are safe, you should ask your doctor on how to proceed with this issue.