When I had double pneumonia and covid it took a month for normal breathing to return.
Hang in there with time you'll feel better every day.
Do you have an oxygen reader fits on a fingertip??
Very cheap, get it at a pharmacy gives you a lung oxygen reading and lets you know how your lungs are doing.
Did they give you any breathing exercises?
Any easy one is four times a day take a deep breath and hold it. Do it several times four times a day.