1. as in roller coaster ride, there will be: sudden pressure changes and exposure to loud music, thus both are described as causative factors to produce pneumothorax
. [also don't go for deep sea diving]
2. usually 6 week time period is required for the collapsed lung recovery, but you should talk with your Surgeon regarding the same.
PS: moreover performing valsalva maneuver
, while frightening during a roller coaster ride can increase intra lung pressure, which might rupture a bleb or even cause pneumothorax again.