What type of care should I research for my wife with progressive multiple sclerosis?

My wife is 58 and has Progrssive M. S. I am 66 and supplying all of her care. For the past year and a half she has lost the ability to get in or out of bed or up from her wheel chair to use the bathroom. I am lifting her 8 to ten times a day. I know that I won't be able to do this forever, and worry about a back problem that cutails this ability with out a back up plan! Also how can I learn what to expect as this continues to progress. I do not know what to plan for 1- year 2 years or 5 years from now. Assisted living , nursing home or what? What is the life expectancy of someone with this disease?