I quit the pain meds early on after my discharge and used over the counter
products as Opiates make me pretty ill, but certainly pain meds will make one very tired. However, I was very tired for a month after my bypass. There are all sorts of changes going on in the body after major surgury. Often, there are blood sugar issues as well as digestive issues. In my case, my diabetes issues flared, and food simply tasted terrible to me for about a month.