I was in this position 6 years ago after 25 years of caring for my ds who needs round the clock care , I was 57 years old.
It was traumatic for both of us.
Firstly you are going through a huge change, you need to give yourself if possible some breathing space.
Your dc may still need a lot of support as well
It will be financially as well as emotionally challenging, your whole life is changing.
I got a diary and wrote down everyday one thing I’d done that I couldn’t do before , a lie in with a cup of tea , watching a film, a walk, reading a book, going to the supermarket st leisure and one thing my ds had achieved on his own as well, which may have been something as simple as letting his support workers administer medication with no fuss. As he progressed I realised I’d done the right thing.
I visited the job centre and found a lovely advisor who wrote me a brilliant cv (you will have more skills than you realise) and job hunting advise.
Also contact your local carers group for help and any courses they offer ( you are still a carer)
I too said no caring jobs!!
I soon found a customer service role dealing with elderly people, which I love. I didn’t need any experience.
6 years later am doing well , I went abroad on holiday last year for the first time in 30 years, my ds is happy too, and remember that’s why you’ve taken this step for them as well.
I value every day.
There is a whole world out there which you’ve missed out on , you are not old , just take one step at a time and look forward to your new freedom
good luck