I was a single mum of twins from the time they were 4 months old until DH and I met when they were 6 and moved in together when they were 8. Their father has had no involvement and I have no family, so I fully understand how daunting it is when you’re truly alone and how even something as simple as a nursery closure day can cause so much stress. But you can do this. If you can cope with your current situation you really can.
I was luckier than you because I had a decent job with a fab boss and only took maternity leave rather than having to start again. He was incredibly understanding and we’re still in touch now. However, I did retrain when the DC started school and I could afford it and started a new career when they were 6 (which is how I met DH). And I’ve learned a few things through all these stages.
I’m not going to lie - the first 4 years nearly broke me. Because I had a job and a mortgage I didn’t qualify for any benefits other than a contribution towards childcare (which I could not have survived without) and I ran at a loss for those four years, selling off everything I could of value and accumulating debt. Child care costs crippled me. When the DC started school, it got easier financially but the same challenges applies practically - inset days and holidays were a nightmare, etc. I relied on friends. I always felt i was just treading water rather than really living. Hence the decision to retrain.
i don’t know what, if any, plans you have for your future, but if retraining exists anywhere, my advice would be plan on that rather than a job when your DC start school. Long term it will pay dividends and in the short term it is far more compatible with being a single parent. Plus you get a lot more support financially as a single parent than you will at any other time.
The other piece of advice I’d give, whatever your plans, is cultivate your friendships. I have three amazing friends (all single mums when I met them) that I really could not have coped without. I love those women like family.
Good luck! Single mums get a lot of stick but I like to point that they are the parents who stayed around for their kids and raised them, on their own. Most are strong women.