Maybe talk to a gyno? I have really bad cramps and midol makes me feel sick. I just take ibuprofen and it helps a bit, but definitely say something to a doctor.
I have the same thing, and I asked my doctor, he did some test and I found out I have dysmenorrhea. It's nothing bad, but it has something to do with heavy,
And very severe cramps, but I don't know what causes it.
You might want to check with your Doctor