The pulley and the rope sounds like something I would do.....which means, don't do it!

Maybe if you got some better pain meds, you could walk more. If it is not weakness, but only pain, you could build yourself up somewhat, and very slowly.

I don't know your situation, so I have to refer you to a physical and occupational therapist for help. See if they can get you moving. We don't do well when we let inertia get the best of us...I know, I am fighting it myself, and I hurt as well....pain is one thing, weakness and inability another.