I am 35, for the last 7 yrs I have been missing periods, and the last 3 yrs I haven't had any except for a month here or there ( 9 month span not uncommon) and was never sure why. I asked my doc (new family doc) about 6 month ago about it he told me basically it was because of me being over weight. With in the last 4 months I have started having them again, they are heavy, and it seems when I am not in the middle of a flow I am spotting almost everyday, and having flow sometimes 2 times a month. today I have been flowing for 5 days and now i am having cramps that started today and the flow turned a bright red yesterday.

not sure whats going on would appriciate input, I am 35, have 6 kids, not on birth control, I had tubes tied, 2yrs ago. my last baby was born 3 1/2 yrs ago.
Is this normal aging stuff or should i seek a different docs advice?