Hi Majdi,
Being a support worker is such an important job and we are lucky to have you in the UK! With this type of role, I can see it may be more difficult to achieve the kind of flexibility at work that some other roles may offer. As others have said, I think it's important to have an honest conversation with your employer at the beginning, particularly if you have caring responsibilities yourself, so that there are no misunderstandings later on.
Some people find it really easy to switch off after work - I am not one of those people! You will know what works for you, but I find exercise or a good film helps me to take my mind off work. I never work on holidays. I try to plan at least one fun thing each weekend with friends and family, where I can completely switch off from work. Some people like yoga/meditation. Ultimately, it is important to build some time into your week for yourself, to relax and recharge your batteries, even if it is just a couple of hours.