total colectomy with IRT - energy level

I had this surgery almost 2 years ago. I can't predict how an activity is going to affect my day-to-day energy. I went for a drive and walk on a sunny cool day. Maybe I got dehydrated. a little. I got home, felt nauseous, took ondansetron, more than a little water, some food and was exhausted the rest of the day. Watched tv.

Prior to my surgery I had lots of energy. Thanks for your replies