Period that causes pain and passing out

I am a 19 year old female and I have had my period for the last five years of my life. The last six month I have been experiencing enormous amounts of pain during my cylce along with spouts of cold sweats, dizziness, and passing out. I've tryed iron pills, multi-vitiamins, keeping my blood sugar high, and I have had two blood tests. For the first day of my period (which lasts three days) I am hardly able to do basic functions such as driving my car or when it is really bad even walking. I feel very alone on this and that doctors I have seem haven't given me any advice but to go get my blood tested. My blood is just fine thank-you. SO, does anyone have any suggestions?

Thanks.