i've been through that... more times than i can recall quickly...
they were accompanied by multiple broken ribs.
damn scary not being able to breathe, eh?
the last time it happened, i was looking at Peterbilt Truck Grill, and then the airbag went off a few seconds too late...
i remember struggling to suck in air, and all i got was gunpowder smoke and talc.
Death was seconds away........ i had time to consider it.
I freaked out the EMTs when i woke up.. they were calling the Morgue Wagon when i suggested an ambulance might be a better choice...

that must be one brutal stairway.

i partially re-inflated my own lung, which further freaked out the EMTs (i'd been through this several times before)... i then told them how to get the car door open without hydraulic assistance... it involved unlocking the door.
The ambulance driver got a crash course in the relationship of Braking and cornering as we navigated the curvy Highway towards the hospital... he was doing much better by the Third set of twisties... which was also about the same time the third load of morphine kicked in.... I woke up again in 20 minutes or so... the downhill traffic going into the Tunnel had us doing repeated stop-starts... people don't know what to do to get the hell out of the way of an ambulance... maybe they're waiting for some app to tell them?
The Life Flight Chopper was busy with another accident... 6 cars on a Major Highway, in a different tunnel.. an emergency spleenectomy was one procedure i heard mentioned... i only needed a couple plates, a handful of screws, a yard of wire, and a spiral fracture of the collar bone stuck back together... meh. the sternum plates still hurt occasionally... the spiraled Collar bone hurts the most.. they never heal.
the internal organ bruises were interesting to deal with...

have the doctors helped you figure out what caused the Lung to collapse?
i recall the vent tube insertion hurting a lot more than the lung collapse... i vaguely remember kicking some nurse in response...