What is the best way to relieve menstrual cramps? medicine does not really help me.

Cramp options: If your have indeed tried optimal doses of different medicines, then the next option are external things like increasing exercise, warm packs on abdomen, meditation combined with medication. If still no relief, could look into hormonal therapy with oral contraceptive pills to decrease associated menstrual symptoms. But first would make sure you've exhausted "all the medicines" as you stated.