I have an increased extreme fatigue at 4 weeks post op Tummy Tuck, is this normal?

I am 4 weeks post op TT tomorrow. I have been experiencing increased exhaustion daily. I just want to take several naps throughout the day. When I wake up, I'm not really rested and not motivated to do any kind of activity. I was very active on weeks 2-3. I don't understand why it all of sudden has gotten worse. I feel similar to day 5-10. I'm completely off pain pills, I do still have some pain and aches, manageable though. Swelling has increased somewhat also, what do I need to do?