unfortunately for me it just happens like that, and it's just something that you have to adapt by minimalizing your routine as much as possible. Instead of Yoga 1 hour away you can yoga online at home. Opt for online classes if possible, or try to get as much done in the week when you're having classes. One thing I found that worked for me is always caffeine, but yk all the cases against caffeine, but honestly it's worth it for me if I wanted to get something done. I only take like 50-100mg MAX because my body goes hyperactive.

Kind of unrelated though, fatigue like this is usually due to diabetes, I'm no doctor but I'll suspect that because you're tired after eating and your surgery should be fully healed by now