At the risk of telling you stuff you know, have you had a look into respite care?
Caring can be exhausting, so it's important to have some time for you. This will help you and the person you care for.
www.leicestershire.gov.uk
When my Dad was needing 24/7 care, I found a local charity who provided 4hrs 'sitting' respite. It allowed my Mom a bit of a breather in the week so she could get out and see her mates. Weekends i could help, but work in the week etc.
Different council, of course, but all the options should be listed on your local council's pages.
Might be useful to know for anyone else in the same boat. It's hard being full time carer 4 hrs might not sound much, but just doing something else for a bit was huge.