I felt bad the first week. No energy and dehydrated. Second week wasn't as bad, but still didn't feel like I could have returned to the temperature extremes you are describing. All I can tell you is drink, drink, and drink some more. Good Luck to you and your wife. I am now 8 weeks out and have been back to work for 3 weeks. I feel great now and have already lost 40 lbs. It is all worth it!!!