Welcome to HCM,
I will try my best to provide you with best possible professional recommendations to your questions.
As you had pneumonia
, your white blood counts are elevated, they will return to normal once the infection has subsided.
Get blood workup done as Your doctor as advised, to see for any recurrence or any residual disease.
Your symptoms of myalgia
and weakness are post-infectious and will subside, you can take some multi-vitamin supplements.