This is Dr. David
short term use of steroids over 1-2 days, you usually don't have to taper down from 40mg of prednisone
if you are on steroids for longer periods of time, then you have to taper down.
steroids can cause gastritis and upset stomach. stomach acid reducers like zantac, maalox, mylanta, prilosec can help indigestion.
you need to find out why you developed pleural effusion.
if the fluid comes back in your lungs, this can cause chest pains.
do you have a history of smoking? or heart failure? heart failure or weakness can cause pleural effusion.
a lung cancer can cause pleural effusion as well. you may benefit from a PET/CT scan or a pleural biopsy to check for cancer in the pleural space.
let me know if you have questions.