Very scary stuff.

Please let us know what you find out. I've been active my whole life but have become more sensitive to outside influences. I've been known to go out for an evening (not even in exercising) and end up not breathing well due to cold/damp/smoke. There are times my ribs feel bruised if I touch them from the outside.

It's surprising, kinda, but I know how I am and how an otherwise active "healthy" person can succomb to strange things.

I don't know anything about COPD and I tend to avoid inhaler things like the plague. Could be my downfall but I am curious as to how you fare.

I'd say 2nd opinion definitely. Then maybe try to find out why it happened?