To feel this down?

[Sadtalp]

I feel overwhelmed by everything. Work full time, have ds 2 on my own mostly. His dad takes him out every week or so for a full day. I feel constantly on call and constantly on edge. I worry about money, health etc. I am trying to survive and managing but it’s no way to live. There are no magic answers as I have nobody to help such as grandparents etc. I can’t afford additional childcare and even if I could I would feel horrendously guilty. Life feels so miserable and so hard. I never have a moment for myself.

You say dad takes him out regularly for a full day, so that’s more than a moment to yourself. Make the most of that time.

Are you a single mum? Do you get any nights without interrupted sleep?

I feel constantly on call

This really stood out for me. It's like you can't relax even when presented with the opportunity to do so
Do you think a visit to the GP might be in order?

I feel for you, OP 💐🙏
What's the situation with dad? Could he take him for another day so you'd have one full day more?

Could dad have him overnight? What are you doing when he does have him? You should be using that time for yourself.

You say you can't afford childcare but have you checked to see if you'd be eligible for the free 15 hours for 2 year olds? Do you work?

She's works full-time.

I think as a parent you ARE constantly "on call" even when he is with his Dad. It's just another part of being a parent. When you suddenly become fully responsible for another human being it is a huge change and you worry about everything.
You eventually adapt and that responsibility becomes part of you which is why it is so hard when they start to become independent and leave home.
Money worries and health worries are normal just amplified if you don't have a partner to share those worries with. I think most people worry about money and health whether we are parents or not.
No solution just the reassurance that what you are feeling is completely normal.

Are you a single parent? If you are, you could try to get your ex to take DS for a full weekend (Saturday morning to Sunday bedtime). If not then you need more help at home - does your partner work away? Shifts? Or does he just do nothing?