5 days is detox not rehab. I spent most of my 5 days of detox in bed. Heck I couldn't do anything - had to have nurses help my to use the bathroom - it took 4 days before I could go on my own.
Detox is mandatory - you WILL detox, with or without medical supervision once you quit drinking.
Rehab is much more involved, usually at least 4 weeks and voluntary (unless the court system steps in) and you'll be very busy.
Good luck and let us know how it goes.