Hi there
I am VERY limited with excercise too, I have a little pedal machine that you can use whilst sitting on the sofa but my hip and back are soo bad that I cannot use it.
I am also restricted with arms/neck/hands but you can do gentle upper body excercises sitting down that increase your heart rate which is what I think they want you to do. Even small circular arm movements and lifting baked bean tins or similar all helps to burn energy.
If you are not working you may be able to apply for a leisure card in your local borough that gives you half price access to swimming, and other sports facilities. Uusually you can use these between 9am and 4pm weekdays. I also have the same problem as you regarding getting to and from the pool. And more importantly in and out of the pool. If you contact your local council you may find out you qualify for a taxi card which also includes the ability to book the mobility bus.
Also a lot of pools have a special session at least once a week for people with disabilities, they use a special lift for access in and out of the water.
You can also get excercise on prescription from your gp. As your pool is so far away, maybe you could see if there is an excercise group in a hall or community centre nearer to home that you could try.
These are all options I am looking into at the moment as I am almost completely housebound and sick of it. Also have you considered getting a mobility scooter as maybe that will allow you to get to the pool. I have up to now only used the mobility scooter when shopping that they provide, I am very self conscious of my size and hate the looks I get from people who think I only use one because I am fat, now the weight is coming off, I am thinking it is probably a good idea to invest in one.
Dont panic too much about it, just try and increase your activity a little, do what you can.
Oh and your gp should also be able t refer you to physio at your local hospital, they will be able to find suitable excercises for you, they may even have a physio pool you coudl use.
Xx