Just some advice, you can’t get signed off sick because you can’t arrange childcare or your husband needs driving to appointments. You need to actually be ill yourself. Maybe you are experiencing high anxiety, and the GP will then do a questionnaire to asses your symptoms and decide whether being at work aggregates that or not and make a decision over a sick note. If you are getting signed off, that’s about your health, not someone else’s. I doubt you can get signed off long term on anxiety as the GP will need to keep re-assessing to see if your condition has improved, it’s not about your homelife situation, it’s will be about whether prescribing medication has improved your symptoms etc.
If you are wanting to hold onto the job long-term I would steer away from long-term sick leave. Your circumstances won’t be fully considered if you are off long enough to trigger a capability review as it’s only your own physical/mental capacity to carry out the role that is considered. After a short while you may also be referred to Occupational Health will look at workplace adjustments to help with your condition, but they won’t be able to recommend not working long term unless you want them to terminate your contract, so you have to play along and say you are keen to get back to work.
I would recommend being honest with your manager and saying you are at high risk of being off sick or being unreliable over the next year, and ask if there are any paid/partial paid options for leave on top of your annual leave and if that is no use, ask for a 1 year sabbatical…unpaid, but many employers will agree to it on the basis that having to deal with a lot of sick leave and possibly capability reviews and tribunals is something they will want to avoid.
Remember that if you do end up having to give up the job in this process, that a new employer in future may ask as part of the referencing process how much sick leave you took in the final year of your old job. Many employers now also do medical screenings as well, so you would have to declare it there as well. Often these are tick box assessments and don’t leave room for the ‘why’ you have had long term anxiety causing sick leave, and will just mark you as a high risk to the company.
If you can get time off and you have a car each, sell one to raise cash as you don’t need one each if he has you to drive him to appointments. Also look into benefits he can receive, if it’s classed as terminal he should get PIP if you are his carer…maybe call citizen’s advice and find out about what other financial support is available. You may get a carer’s allowance etc.
I know money will be a concern, but if you can do it without risk of homelessness, I would take the time out of work, even if the job isn’t held open, you would be leaving at this point with a solid reference. Your DH’s health will be impacted if you are not there and are stressed about work and childcare and transport issues etc, plus over the next year the time your children have with him is precious and so you should prioritise facilitating that for their sakes, avoid sending them to after school clubs etc if you can be at home as a family.