You can apply for a needs assessment from your local Children with Disabilities Service (part of the social care department) to see what help they may be able to offer both your child and you as a carer.
To find out how to apply in your local area, enter your details here: https://www.gov.uk/apply-needs-assessment-social-services
After applying they'll normally get back to you within 48hrs, telephoning to discuss why you think you need an assessment and telling you the next steps. If it's determined that you meet the eligibility criteria to have a full assessment, a social worker will arrange to visit you within 10 working days to complete the assessment (it is a requirement that they see your child as part of the assessment). The social worker will meet with you to discuss your situation, what help you would like and what they might be able to provide you. They will discuss things like your child's care needs, the affect this has on your life and the support network you have. They will complete the assessment within 45 days. Their report will be shared with you and any needs Identified will be developed with you into a child and family support plan.
To many the idea of volunteering to be assessed by a social worker might seem strange, but they can be an excellent way of accessing support services and finding out about assistance that you didn't even know was available. (Support available can include support from an allocated social worker or a child & family worker (CFW), direct payments that enable parents and carers to employ a personal assistant (PA) to support their disabled child and allow some breaks from caring, home care support or support to access the community through a specialist care agency, overnight short breaks, specialist assessments and behavioural support through organisations such as Aspens, access to targeted short breaks provisions, including after school clubs, Saturday clubs and holiday play schemes). Also your report from this assessment can be helpful when applying for other support, such as in a DLA application.