On and off periods with pain

I'm a 21 year old with 2 children both were born via c-sections. I have had my tubes tied (medical reasons). After i had my last child 2 years ago i had a continual period for over 6months, A doctor gave me a thermal ablation (its supposed to help stop bleeding all together). A few months after i had that done, I began to bleed for a couple weeks at a time then go a few months without any thing. Then it goes to heavy bleeding for 3 days then light then heavy then nothing for a day then it starts all over again.. I have tried the pill that didn't help either.. The last doctor I saw about told me I could try a hysterectomy..... I cant see having that done at my age. Any thoughts?? Anything at all would help.