I think we're dealing with a couple of issues here. The loss of stamina is contradictory and if the procedure has been performed properly it should INCREASE your stamina than decrease it. So we need to start lookin that up and get an Echocardiogram
done to make sure that everything is well with your heart.
as far as the pain is concerned, we could start on drugs like tramadol
and the opiates. we also could give you patches of these drugs so that steady pain relief can be obtained.
Please see your general physician. Pain management is definitely not a issue if done properly and we need to do a ECHO done as well
I think you would need to speak with your physician about positional drainage
and steam inhalation. this will help resolve the after effects of the pneumonia
hope that helps