A lot of what you have described will probably happen at your next job....except to try to find a place that has an elevator. My son is a system's administrator and does a lot of that stuff too and he can have some very long hours, too.
This might sound crazy, but could you make a small platform on wheels that you could sit on and roll around under the desks? (Kind of like they have at car repair garages.) It would be easier on the muscles and you could still get the job done. That could help one of the problems. Finding a job where there is an elevator would help solve another problem. But, you can't do anything about people panicing about their computers. We all do that!
I know, though, I would definitely find a new job before I left the old one behind. There are too many people looking for work right now and I don't think you want to be unemployed in this economy.
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Fibromyalgia, Crohn's Disease, Ostomy, Diabetes, Autoimmune Inner Ear Disease, Osteoporosis
God does not give us a spirit of fear, but of power and of love and of a sound mind. 2 Timothy 1:7