Hi Jeannette, I totally sympathise with you as my periods were irregular for years.
I've now got the Mirena coil and I can honestly say its the best thing I could have done. I don't have periods at all now. You don't say if your family is complete, because obviously it's no good if you want to have a family, its a contraception, but its brilliant for sorting out heavy, long and irregular periods.
It might be worth asking your GP to refer you to a specialist and you could discuss the option.
Good luck.