I think im addicted to painkillers how do i tell my partner and help

From the outset I look a very happy person I have a great home life, friends im at uni going into my second year have a lovely boyfriend. But I think I have a problem. A few years ago my ex left me and cheated on me, I was in a very bad place at the time I couldn't sleep or eat for months, I got chronic headaches due to not eating and ended up being prescribed codeine by my doctor, I found that taking these use to basically knock me out at night time and help me sleep, it got to the stage when I was taking nearly 8 codeine tablets a night just to sleep. I ended up in hospital after what I can only describe as a mental break down, however I received no help from doctors or hospital and nobody questioned the codeine. I went cold turkey had severe withdrawl symptons sweating vomiting the shakes etc. Over 2 years on and Im doing fine I hadn't touched any medication I met my new boyfriend and it was all great. The last term at uni was horrible I hated uni as although I had 'friends' non of them were real friends they were people who would stab me in the back and I just didn't really click with them. I did **** in first year I didn't fail but got 56% (2:2). I had a horrible flat and could feel myself unable to cope I started taking codeine again to help me sleep. However the past month at home its getting out of hand again, I suffer from M.E which makes me feel like I basically havea constant hangover im shattered I ache and I feel sick but I can never ever fall asleep, ivebeen stressed about going back to uni. On top of that ive been arguing with my boyfriend hes become more concerned with clubbing and his mates than spending any time with me. I know a lot of it has to do with the tiredness and M.E but ive become increasingly paranoid that hes cheating on me and im insecure. When I couldn't sleep because he was out and I was worrying or what no again id take a codeine to sleep. Its now got to the stage when im taking 4 a night just to sleep I think I have a problem but have nobody to talk to. I want to tell my boyfriend without sounding like some deranged mad druggie but don't know how to broach the subject nor what should I do.

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