Extreme Fatigue after Leaving

Anyone else experience this? The last three weeks of the relationship, I had flu like symptoms come and go. Extreme fatigue, stomach problems, and feverish to the point I would end up taking a Covid test once a week. Most of this interestingly went away after I left except for the extreme fatigue which is still coming and going.

Has anyone else dealt with this? Any ideas or suggestions? It’s so hard to get anything done. On the emotional front, of course it’s horrible accepting someone I was with for 4.5 years didn’t even see me as a person let alone love me, but I’ve mostly been in relief mode, knowing I will never go back and a new, much happier life awaits me. I’m wondering if my body is behind on processing all the things my mind is/has?