What Causes Excessive Bleeding And Discomfort During Menstruation?

Hi i'm really worried. for the last 70 days i've bleed for about 35 of them. i don't have unusual pain during the bleeding between periods but there is a little discomfort. it's not normal period blood, it's bright red and i'm 90% sure i'm not pregnant. the first time was in august i bleed for about a week then it stopped then i got my normal period with the most excruciating cramps i've had in years, bleed like i was dying and then the next couple days were light then it stopped. the next month i don't remember clearly how long i spotted but then had a very short period. in october i started on the 8th, menstruated for a few days then bleed out of my cycle for about 2 weeks and then had a seemingly normal period at the beginning of november but it was a few days early and i'm not sure when my period is gonna be coming next but i started bleeding about a week ago and it's not period blood. like all the other in between bleedings it's bright red and not thick like menstruation