3 days till my surgery.
As you loose weight you are loosing "insulation" things are going to get even colder so be prepared for that. Your liquid intake is likely more than it was before and therefore more output. Yes I would say that what you are experiencing is extremely common and exactly how it should be.
Wishing you a great experience in the next 5 days as those will be tough at times.
VSG on 12/17/12
VSG on 01/02/13