Extreme fatigue?

Has anyone experienced extreme fatigue for weeks after THR? My surgery was Nov 2. I didn’t need pain meds and had very little swelling—just this incredible fatigue which was totally unexpected and persists 5 weeks later. I’m trying to transition back to work an hour or two a day (I’m a personal trainer/running coach) and need a nap after each session! If this fatigue was part of your recovery, how long did it last?