Suggest Remedy For Periods Problem

I am 48 years old. Have been to doctor been checked by Ultrasound and have had an Endometrial biopsy done, hormones levels checked and are normal. I figured I am perimenopausal!! I have a menstral cycle for 8 weeks, very light to start with just enough to require slim tampon and now it is very heavy with blood clots that are forcing tampons to dislodge themselves (this has been going on for 3 days). Thjis cyce started around May 1, 2011, the one before that was in January and it lasted about a week?? Got any ideas? I have no health issues (except this one). I have had three pregnacies, first one was a miscarriage other two were normal vaginal birth with healthy children. I am on no meds. I have put on weight in the last couple of years. I had been about 110-115 until I hit 45 and now I weight 148. I am 5'3".