It sounds like you are experiencing significant challenges with your mental health and daily functioning. I'm sorry to hear that you have been struggling with this for some time, but it's great to hear that you are taking steps to address these issues and are planning to take a gap year to focus on your mental health.
In terms of financial and social support, there may be resources available to you. Here are a few options to consider:
Disability Support Allowance (DSA): DSA is a government benefit that provides financial support to students with a disability or long-term health condition. This can include mental health conditions. The amount of support you receive will depend on your individual circumstances, but it may cover things like travel expenses, specialist equipment, and personal care support. You can apply for DSA through Student Finance England.
Access to Work: Access to Work is another government scheme that provides support to individuals with a disability or health condition who are in employment, including self-employment. This can include mental health conditions. Support can include things like workplace adaptations, travel expenses, and a support worker or job coach. You can apply for Access to Work through the government's website.
Local charities and support groups: There may be local charities and support groups that can provide additional support, such as counselling or group therapy, employment support, or social activities. You can search for local mental health charities and support groups online or through your GP.
University support services: When you do go to university, be sure to take advantage of the support services that are available to you. Most universities have a student support or wellbeing team that can provide a range of services, such as counselling, disability support, and academic support.
It may also be helpful to discuss your situation with your GP or therapist, as they may be able to provide additional advice and support.