Hello and welcome. My name is XXXXX XXXXX I am an experienced small animal veterinary surgeon, I will be very pleased to work with you today and will try my best to answer your question to your satisfaction.
I know this may not be easy for you but this does sound quite serious, you could b eright about a collapsed lung but other diagnosis are also possible.
The snag is that ther eis nothing whatsoever you can do for Bert on a home remedy basis, you have to somehow get him to a vet ASAP
Okay so your advise would be to go to the vet?
I wish I could suggest something more, but those sadly are the facts ...
Yes, get Bert to a vet ASAP ...