More trouble walking

Things have been okay the last few days, with no angry outbursts.  Nice to have the peace at home with Christmas approaching.  However, hubby has had more and more trouble with dizziness and/or falling.  Not sure how much is spinal stenosis and his legs giving out, and how much (at least the dizziness) is caused by circulation problems.  He has already contacted the VA about getting a wheeled walker with the seat.  I know it's getting bad for him, to admit he needs the walker!  Really concerned, not only for him, but also for me . . . and also feeling selfish for feeling this way.  How long will it be before I can no longer leave him alone for extended periods of time?  He has talked to more than one doctor about possible surgery to fix the stenosis, and no one wants to touch him because of all his other health problems.