He will help you get better no matter how bad cramps are. There is absolutey nothing wrong with talking to God about periods. Because of eve, we all (women) have bad cramps when on our periods and give birth. If she hadn't eaten that apple in the first place when God told her not to, then we wouldn't be in this mess and hurting like this in the first place. But it's unfortunently natural. Every time I'm on my period, I always sarcasticlly say "way to go, eve" I was on my period about a week ago and almost every time I'm on my cycle, it literally makes me sick and barf. But I just try to take it easy, take a pain pill, stay in bed if I need to, and wait for it to be over. Periods don't last forever. God knows everything including our female or lady problems. You can ask him to ease the pain all you want. His healing is your medicine.
