Sorry to hear you’re having a rough time of it. Have you spoken to the Citizens Advice Bureau? They may be able to help advocate for you. Also, your GP may have a patient advocate service that helps people get the care they need, if you haven’t asked them yet it could be worth a shot.
With the rules all over the place with lockdown, safety at work, PPE etc, it’s very hard to know what’s going on. If you’ve received the care previously and the service was stopped due to lockdown, I don’t really understand why you’ve then got to have a new assessment to restart it – that’s a point to argue with them.
Have you heard of the website/app called NextDoor? It’s a local site that connects people in your community – it could well be worth signing up to ask if anyone knows of local charities etc that could be of help in your situation, too. You might find some kind people offer additional assistance such as going to the shops for you (and the NHS volunteer groups are still running so they might help, too).
If you’re feeling low, remember the Samaritans are always there for you 24/7 on 116 123 (no area code required), or you can write to them via email or post – the info is here: https://www.samaritans.org/how-we-can-help/contact-samaritan/