I'm sorry if this comes across as being blunt, but I have a tendency to speak my mind. The feeling I get from your responses are that you have conceded defeat, as you have come up with a reason not to do everything that has been suggested.
So how about a new approach?
You need a plan, and unfortunately you have to create one now... because, without getting help for your food, insulin, and medical help for your toilet issues, the future isn't very bright. However, you are the one person that can change this outlook.
Firstly, the insulin issue is a non-issue. Many chemists will deliver prescriptions. Call your local chemists, set up an arrangement, voila. They'll pick it up from your GP, fulfill it, bring it to your house.
If finance is an immediate issue, then you need to speak to your GP about the Foodbank. He can refer you. It may also be worth phoning the foodbank directly as they will be able to advise... the telephone number is 01202 669566.
I've been a volunteer with the RVS (Royal Voluntary Service), and they will help you with shopping if you just need someone to go and get it for you. The Dorset and Wiltshire Hub Telephone number is: 01305 236666.
There are all kinds of community transport services in the Poole area. Check out this link:
http://www.poole.gov.uk/transport-and-streets/public-transport/community-transport-service/
Once you get on top of controlling your basic problems, then think about getting out and about a little more every day... even if you walk down the street and back. Right now you have the ideal opportunity to improve your level of fitness. You don't need to do much, just get moving and stay moving.
All of this is really down to you and your willingness to face your hurdles head on. There's many, many people here in this group who have faced similar hurdles and are offering help to you because they know precisely the kind of things life can throw at us.