Carol one thing I can say is that it sometimes takes a long time to get a power chair. So if you think you might be needing one in the future it is a good idea to get the process in motion. Beth had a terrible time, I think it had been 5 or 6 months and at least as of a month ago she still didn't have it.
That's good that you are still able to get around on your own, 2 years in. It does sound like you are coming to the limits though. It is so hard to predict, to know what to expect.
I am lucky in living in a pretty flat 1 story house. We have a small step in the middle but a piece of plywood with some magazines under it took care of that. Got a loaner chair from MDA and I use it quite a bit even though I can still walk pretty well. I could walk 2 or 3 blocks if I took my time. But I use the chair a lot, I enjoy it and it rests my legs. I figure if I want some exercise, I'd rather go out with my walking poles and get some fresh air, rather than tire myself out limping back and forth to the kitchen and bathroom all day.
Going out in public in the wheelchair did make me a little self conscious the first few times. It helped, in my own mind, knowing I didn't absolutely need it. I could stand up and walk if I had to. I actually felt a bit like an impostor, but then I thought hey, I have ALS, I have as much right to use this as anyone. People are mostly very nice and unusually friendly. I always let them help me, I figure it helps them feel good about themselves. I'm really doing the world a favor, spreading good cheer as I go.
The point is, I try not to think of a wheelchair as a prison and loss of freedom. Even at my stage the wheelchair mostly gives me more freedom to go places I wouldn't try otherwise. I'm going to be doing quite a bit of travel in the next few months, 3 flights planned, one with 3 legs each way, and I'm bringing the chair for sure. I don't know how my legs will be by then but even if they go on me, I'll be fine because everything is planned out and I have the resources I need.