I am a medical social worker. Before bashing it, I love my job. It is fantastic. I get to work in the emergency department, with mums and babies, in intensive care... (canada). I could never do teaching because, while I love children, I need the break from being "on" all the time.
There is a significant shortage in the UK... I believe there are bursaries to train and the field is very well paid and diverse. Good luck with your choices.
I'd really consider a change of school before leaving! Lots of schools will offer flexible/ part time working if that's what you're interested in? I'm a teacher and set up The MTPT Project because so many good teachers are leaving when they become mums. Google Return to Teach and Flexible Teacher Talent who might be able to help out. Sometimes a change of school/ culture can reinvigorate your love of teaching.
Also try Education supply companies - I work at an edtech company and our account managers are mostly ex-teachers working school hours during term time. If our customers are on holiday there’s not a lot we can do.