I have been on my period for 3 weeks now.. I also have pain in my lower stomach.. I had a misscarage this passed January and I haven't been the same ever since I don't know if that has anything to do with it.. I feel really weak and dizzy most of the time.. this is so uncomfortable.. can anyone please help?

You need to see a doctor. It's possible you are now anemic from losing so much blood. There might be a link to the miscarriage, but without a physical exam, you'll never know. Please see a physician ASAP