Like me you clearly have a bad case of it, it really is dependant on the person in my opinion.
The days usually started off with me feeling achy but a bit of energy but by midday I was exhausted and lay on the sofa coughing constantly. It got to the point I'd fear coughing as it felt horrific on my lungs and it felt like it hurt my heart.
Hopefully you are through the worst of it now but if not get well soon mate, anyone playing this thing down don't know how bad it actually is.