I have had heavy periods and extremely painfull ?/?

I have heavy painful periods too because I have irregular cycles. I know that the more irregular my cycles, the more thicker the walls of the endometrium become, and so they can be very very painful like I can feel everything that goes on in there or when I'm about to get it : / The dizziness and nausea come from the fact that you're losing alot of blood. It's very important to get enough iron in your diet to replenish the iron stores especially if you have heavy flow. I remember getting up one time, and I almost blacked out and I had the shivers and shortness of breath. I was temporarily anemic meaning short of red blood cells because I lacked enough iron. Eating meat, or breads that have iron fortified will do the trick. Eating something with Vitamin C with iron will help the body absorb iron. As for pain, I take 2 advils of 200 mg. It seems to make me feel better after 20-25 minutes. Make sure you get enough fluids like water because of the loss of blood.