Terrible af cramps!!! Help!!

This month my af seems to be crazy! Im having cramps on 3rd day too n thy are so terrible,am in tears right now! I usually have cramps on 1 or 2 day sometimes.I know about the pain killer n heating pads. But is it any thing to be worried about? They are terrible like something is stuck inside my veins in lower abdomen! Please leave comments n help! :(should i visit doc?