3 days seems a bit soon....
I was given my medications whole in the hospital. Never told to crush them.
Loose skin happens. Not a whole lot you can do to prevent it unfortunately. May be able to tighten a little with exercise, but some areas may be too far gone for even that. Same with hair loss. You can try all the tricks of the trade, and you may minimize it, but you won't ever flat out prevent it.
Your doctor will clear you for the more strenuous exercise other than walking. Usually around 6 weeks out.
Great questions! I am pre-op for December 19 and I had the same questions, as I have a very strenuous job!
Thanks!