I've been where you are - I'm a single mum of 4 with a history of self harm, suicide attempts, mental health problems, abusive relationship.... you name it!
When I was at my lowest, the last thing I wanted to do was reach out for help. I wanted someone, anyone, to see that I needed it and offer it. But the automatic response to 'are you ok?' is 'yes I'm fine' because it is soooo hard to admit you need help, even when you really need it. It doesn't mean you don't have friends, it just means they don't realise how bad things are for you and that you need someone to help you regain control and point you in the right direction.
What I've come to realise is that I can only rely on myself and I have to be well for the sake of my children. My eldest has seen things she should never have seen and it's not fair. You have to push for an appointment with your Dr, they can't refuse you. It gave me a push to get myself better for them, not for me, for the children. I didn't care what happened to me, but I had to be better for them. And that's up to you, you can't rely on your mum or friends or anyone but you I'm afraid. But when you do get better, you can be so proud that you've done that yourself. You will find the kids easier to manage as well, I promise. My eldest and I were on the brink of killing each other but things have improved so much since I got help and worked on really improving myself, stopping the self harm and working on the mental health.
Please PM me if you need to talk. Honestly, I know exactly how you feel x