I agree with most everyone. I would think its a mix of the pain meds, which maybe he should try moving down to tylenol or something? And the fact he is eating so little will make him weak. Definitely kick up on the vitamins, I take a multi vitamin, biotin, iron, and a prilosec everyday. I probably eat less protein than I should, but I am just not hungry. I make sure to eat protein first and stay away from carbs, which don't taste as good anymore. I eat pretty much what my husband eats, just a small amount. I can be happy if i just eat a bite or two of stuff and do not snack like i did before. Exercise is also important, make sure he's walking a little bit at least. I did the walk away the pounds dvd for the one mile walk in the beginning, it will help him and amazingly heals him faster. It's a journey and the doubts will come, but it gets better Good Luck!