I am one that needs taking care of. I am not bed ridden but wheel chair bound. I have extreme spasticity and muscle weakness. Here are some things to do if you are up for the challenge.
incontinence - I wear adult pullups and get them delivered to my door (UPS) free w/ monthly orders. I purchase them at HDIS and if you mention MS you get a discount. This helps keeping any mess contained.
There are portable toilets/hanging bucket from a chair type frame. if your wife can transfer herself if it is located lets say next to the bed for those late night episodes.
bathing - if your wife is bed ridden get wet wipes for aka sponge bath also sold at HDIS if she can help you help her ...get a bath chair any plastic chair that would fit will do. you will have to learn how to transfer her. (later) if you can change out the shower head to one that can snake this is much easier to direct the water...i have one and it's great.
transfering - remember watch your back...use your leg muscles...square youself to your wife do not try to pull on one side use both arms remember a womans center of gravity is her rear end
so if you need to pick her up for some reason ....
there is so much more feel free to PM me for more details