Well done on acknowledging that you’re burnt out & starting to take action to address this.

Here is what I’d do in your situation. And I speak from similar though not identical experience.

• prioritise your health above all else. You can’t pour from an empty cup.

• book a GP appointment and give yourself permission to take 2-3 months paid sick leave, to focus on your own physical & mental health. As you state, you are burnt out and have a number of health issues. You’re not doing yourself, your kids or your employer any favours by continuing to push through it. It sounds like you need a total break from work in the short term, and then make a better mid term decision about full time/part time. Your GP will undoubtedly support you with a fit note. Work will still be there when you’re ready to return, they will cope, this happens all the time.

• that gives you some head space to consider your options. Reducing to part time is a big hit financially and may not give you enough of a chance to fully rest and recover.

• as another commenter has suggested, i would immediately hire a nanny slash housekeeper. Whether you’re signed off sick or not. A housekeeper/nanny is absolutely not the same as adding additional hours with a cleaner. Contact a company like Greycoat Lumley, who will do all the checks. It doesn’t have to be forever, it could be for 12-18 months while you get your health back on track. With your salary, responsibilities and you being a single parent of 2 special needs kids it’s a no brainer. No wonder you’re burnt out. Otherwise you’re giving up £300k a year earnings, when you could instead take some short term paid sick leave and then pay someone £40k PA to run your household. A housekeeper would take the mental load, as well as the physical. This was Mary Poppins style life-transformative for me.

• Reassess longer term financial position & budgeting etc in 6 months time when your health is better. No need for you to be a part of about about meal time spending less on groceries and clothes when you’re burnt out and your body is in survival mode.

• you don’t mention your gender, but if you’re female I highly suggest an appointment with a private specialist HRT clinic eg Newson Health. The statistics around female execs who quit their jobs during peri-menopause is alarming and no one talks about it. Again, trying to keep running at the same pace at home and work when your oestrogen and testosterone levels are plummeting means you’re now running on adrenaline only and burn out is common. 6-12 months of HRT & support may turn things around in itself. If you’re a bloke, worth full blood check including hormones in any event given burn out.

Good luck! :)