Hi welcome to Health care magic forum.
Thanks for calling H.C.M.Forum.
You had flu
like symptoms , then right mid lobe pneumonia
, then left side pneumonia,then pericardial effusion
.Difficulty on lying down.
It appears there is certainly a long way to travel, in the mean wile you should be cautious about the breathlessness , and you should have all the medicines necesory to have in hand for emergency.
Being an on line doctor i cant be sure of what is going on, still i suspect tuberculosis
, which can be confirmed by examination of effusion fluid after the pericardiocentisis.
Your question is do you have to go to ER or wait till morning. I advise you to go today only to be comfartable till tomorrow morning.
Pericardiocentesis and use of probable drugs will solve your problem to great extent.
Wishing for a quick and complete recovery.