Hey Jeff
I've got CRPS in my left leg, starting in my knee after an operation. I lost a lot of muscle in my left leg, particularly my quad

, and struggled with walking for about 18 months. I was in a wheelchair out of the house, and crutches on short distances. My leg just seemed to have no strength or control and would just fail me randomly. It felt very dangerous.
I had physio for about a year, and the last six months or so were me doing my own thing, keeping on working at it. I'm out if the wheelchair and off the crutches for now. My leg gives way by rarely now, and I can walk almost normally for a short distance. It's a big improvement.
You can get some control back, but it does take time and effort. Do the exercises as often as you can, but not so much that you exacerbate your symptoms. It's a delicate balance, but you find a way through. Never ever give up on it.
Good luck, and take care of yourself!
Bram.