Fatty I hope you’ve managed to see a doctor. It’s horroble to think of you feeling like you do.
I might be wrong but I thought sometimes anti depressants can make you feel worse as a side effect before they help, maybe that’s what your experiencing? Are you under 25? (I can’t remember sorry) as the nhs website seems to suggest people under 25 maybe more likely to feel suicidal or like self harming when first taking the pills.
First step is to sort the right medication from the GP, and then when your a bit stronger you look at changing things within your life.
It’s not surprising you feel like you do currently. Your worried about your DS2, your dd is suffering, you’ve got a useless partner, you also had to have a termination, and it doesn’t sound like you have any family support as such. Let’s face it life is crap for you right now and it’s a lot to have on your shoulders dealing with pretty much alone but it’s great you can see in the fog, know your not right and was able to seek help.
Yes you deserve better than your partner. Much more to being a parent than watching the dc that he fathered while you work your arse off to pay the bills. Unfortunately life isn’t that simple but his a lazy, selfish bastard. He must see you struggling and has he upped his game and stepped up, no he hasn’t its still all on you. That’s not how a relationship should work