Yeah...I didn't explain the 24/7 part very good, sorry.
What i meant is i can't roll myself over in bed at night so i would need help at night as well as day.
I nursed my mother some years ago, she was bedridden and needed to be rolled over every three hours to prevent bedsore, including during night.
During day time helpers came twice a day and took care of that, and in between, my father did and when I was home from work, I took care of that. I could get the helpers under the Public Nurse Care Insurance (kaigohoken) in Japan (we paid 10 perscent of the cost and the remaining 90 percent was covered by the insurance.) Yet the number/frequency of the services were quite limited.
If you're staying home on your own, you might need a live-in helper, which would be very expensive.
Care manager of my mother told me that some security companies are offering the services to visit one's home during night to do this kind of services. We did not take it because getting someone come to our house at night means it did not improve the situation (i.e. I had to get up every three hours everyday, which was extremely tough because I could sleep only a few hours, and if someone comes, then it would woke me up anyway) but if in your case this kind of arrangement might help though it is limited only for night.
Another option the care manager told me is to use a special air mattress. It rolls you at regular intervals (on can set the timing like every 2 hours, 3 hours, etc.). The disadvantage of this mat is one may have nightmare or bad dreams of sea-sickness because of the particular motion it gives, according to the manager.
This may not be very helpful, but just for your information.