OK, now for something TOTALLY SERIOUS... SERIOUSLY
Keep practicing for the date (not referring to the wedding - that is a commitment). The trumpet is an excellent airway clearance device. Keeping the gig will motivate you to REALLY REALLY practice the horn, so you will have REALLY REALLY clear airways.
For the cough:
1) Get your physician to prescribe Tessalon Pearls - Take 1 pearl every 6 hours.
2) Get your physician to prescribe albuterol MDI inhaler
A. Take 2 puffs (spaced 5 minutes apart) twice daily
B. After the albuterol puffs, take in nubulized inhaled hypertonic saline (again, your physician [der Artz] will need to call this in)
i. Then have your significant other to pound your chest over the area of your pneumonia
ii. Try to cough the goobers loosened by your partner up
3) Then go play your horn... you got a gig date to make!
Yeah... I know... I'm good!!! Damned good!!!