Endometrial Biopsy of the uterus!!!

I have a question I'm very scared I've been having abnormal periods sometimes I periods can last for 30 days or longer it started in the summer my periods have been like this my doctor did a ultrasound a vaginal ultrasound like 3 months ago it showed that my uterus was a little thick end and I'm afraid what if I have cancer like uterine cancer or something can anybody give me any insight on this I went for a Endometrial Biopsy on Tuesday my doctor rushed for my results be back by Friday so tomorrow I have an appointment and I'm afraid if I have cancer why else would my uterus be thickening and 40 years old they did blood work on me they found out I'm anemic because I've lost so much blood because of my periods they did some sort of test to see if I was going through menopause and she said that was not going through menopause what else could have happened to me that would make me bleed like this?? has anybody ever had this happen to him the weird thing is when I went for my biopsy on Tuesday my bleeding slowed down some which is really weird to I'm a hypochondriac I'm just really worried that I've cancer I've lost so much blood from my period because they last for 30 days or longer that I had to go get Fusion irons done think that's what they're called I'm having that done on Monday I'm a little scared about that too so if anybody's had this happen to them can you share your experience with me thank you