What contraception to get???

Hi, so I've been sexually active for a while now, and I've been considering going on some form of contraception, especially since I can't use condoms. But I'm not completely sure what type to get. Which do you think is the best option? Also I have extremely irregular periods, so if there's anything that can get rid of that problem, that's a bonus. Oh and how do I go about seeing a doctor about this? Thanks for your help x