I hope you and your sis continue to feel better. I wonder if it has to do with the damage done by the virus when you're actually ill with it. While labs are all within normal limits after the infection, your muscles and stuff are still repairing from infection. Hence, you feel worn out, exhausted and just unwell.
It was a very strange disease. I never felt so tired in all my life, but other than that and the cough it was pretty mild. The cough and the fatigue started clearing up immediately when I started taking antibiotics for a secondary infection, which indicates the virus itself wasn't the primary cause of the symptoms. Then when I ran out of antibiotics the cough came back and wouldn't go away. I never had any lingering medical issues like that from any other disease.
Like I said, I don't know the details of how it works. If you see trees slowly dying after you've put out a forest fire, you know the fire is the root cause even once all the flames have gone out.
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