Anyone else here a single mum who gets zero support and is with their kid 24/7?

I'm 27 and my son is 4 and I get no financial support meaning no child support. My ex hasn't ever seen his son and doesn't ask about him nd doesn't care for him. It breaks my heart every time.

Not only that but never do I ever get any support from even my family to watch over my son to give me any type of break.

It's exceptionally become difficult now that I'm browsing jobs as I can't work holidays, weekends or past 3pm. No one ever offers or is free to watch him .

My mum is crazy and bipolar and despite her raising me and my sisters relatively safely I cannot put my son around her and she is an alcoholic so I probably can't trust her, same with my dad.

I feel more alone than I ever imagined I would in this world. Its just me and my son. Except when he's away at nursery for bare minimum hours I get no time to myself and I never get to fully relax. I've accepted that ill always be alone, no one to help me and this is my life now. I've sacrificed it to raise my son and my ex doesn't appreciate it or care, I don't get money for it and can never treat myself.