So sorry to read your post. I strongly advise an appointment (via telephone/webchat) with your local Welfare Rights (WR) officer as they are independent and will provide you with free representation at a tribunal. WR are also fantastic with the wording of you application/appeal which can be fundamental in some cases.
Finally check with DWP as I’m sure it’s still the case that they are obligated to continue to pay benefits based on your previous award whilst waiting for an appeal to be heard (which could be months). During this time you should be able to keep your vehicle.
Also, give your local supermarket a call. They may be able to allocate you a priority delivery slot based on your circumstances. Very based of luck.