Hi, really sorry to hear about your legs getting worse. I’m in the same position. It’s a good idea to go out for a walk every day. It doesn’t matter how long the walk is, or how fast you go. The important thing is to use your legs for more than the few seconds they get used around the house. I find that a daily walk also keeps my spirits up - the modest exercise releases the naturally occurring ‘happy’ chemicals in my brain and I stay cheerful. Staying in all the time is definitely A Bad Thing.
I’d also recommend getting some physiotherapy, as some simple exercises can help you get the best out of your legs by keeping them as supple as possible.
When there’s a limit to the distance you can walk without feeling wrecked, then taking to wheels is a great liberation. I have a powerchair and I’m thrilled to be able to go (almost) everywhere I used to go, and to be able to travel around London on buses and trains again, all of this without getting knackered! If you’re doubtful about taking to wheels, try to see it not as a capitulation, but as a useful tool which tells the MS monster where he can stick it - you will not be beaten by him and your wheels will show him you mean business! After all, we don’t reject other tools because they represent a capitulation - imagine DIY without an electric drill, or trying to read a book without glasses, or eating your meat and two veg with you fingers rather than with a knife and fork (yuk!) - not to mention baked beans.