The Last Year Monthly I Get These Cramps In Between

The last year monthly i get these cramps in between my period. They get worse and more symptoms appear each time. this last time i was in so much pain i felt as if i was giving birth. (ive had 2 kids without epidural so i know true labor pain) I got nauses. i dry heaved twice but the momment my stomack tightened t throw up i screamed in pain. it hurt so bad i couldnt even pe. I didnt want to get off the toilet bc if i stood up i know the pain would be unbarable. I have pain for a few days before and after the big episode hits. Like i said this is a reacuring thing and no meds help. o have an obgyn apt oct 12 that was the soonest. just trying to get some relife til then. or see if i need to go to hospital instead of waiting.