+1. If you haven't been riding for a while, some body parts will hurt no matter how good the fit is. But it shouldn't be as bad as described in the OP's post. On the other hand, maybe it will this bad if you haven't ridden for a while and then decide to suddenly ride 50 miles.

Hand pain could be from placing too much weight on hands, which could be because your saddle is tilted forward or your handlebars are too low for comfort. It could also just be that you're gripping the handlebars too tightly, or the grips you're using are not very good, forcing your to grip unnaturaly, which would obviously lead to problems.

Back pain could be caused by a huge number of bike fit issues: top tube too long, top tube too short, handlebars too low, handlebars too high.... any bike fit problem could lead to this. If by "back pain" you actually mean "bum pain", then it's fairly normal for a newbie.

Losing sensation for days sounds scary. And what an odd place... upper right thigh. That's not a euphemism for, um, you know, is it? Anyhow, strange that it should be on your right. Is your saddle aligned well? The nose could be pointing slightly right or left, with the assymetry causing a pressure point.