Low mood/depression?

I’ve been suffering for a while now with low moods and anxiety and I’m starting to wonder whether it’s something more sinister. I think about killing myself at least once a day although I never really think that I’d ever do it. I have recently had a breast reduction and noticed a chance in my mood during recovery time and I’m thinking it could be my hormones (my contraceptive implant doesn’t help my case either). I feel like the whole world is against me and I have tried pills and I’ve tried counselling and nothing seems to work. I feel like I try and control my boyfriends life by getting upset when his plans don’t include me as I’m worried he will just leave and never come back. My parents both live abroad although I still speak to them everyday I feel so alone and like I have no one to turn to. Does anyone have any tips on how to lift this and not let it affect your relationship? I want my boyfriend and I to have lives away from each other as we live together but I can’t bring myself to be okay with it at this moment in time.