cramps and pain

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I get cramps so bad it's hard to walk and breathe. my head gets so foggy I get dizzy. I dont even know if this is normal. my legs get shaky and I sit most of the time. my chest feels constricted from the inside. my period is so heavy I changed my tampon like 3 times within 6 hours. I just wanted some opinions on this. I'm tired all the time and I can't think straight.