There are a few threads on this already. A couple are quite recent if you have a look. Basically your options are Billings, condoms, mini-pill, IUD ( the Mirena seems to be a popular choice - that's what I have), Implanon. It sounds like the Mirena might be an option for you but you should discuss with your dr. It has lower hormone levels than the mini-pill but is more effective as it is localised, so shouldn't affect your supply.