Happened right after he started to very enthusiastically eat food. It wasn't much food, though. He also pooped and it was much drier than usual, but I don't know if that's relevant.
Please help. His chest has a bit of a lump on one side which to be honest has been there a while but a few minutes ago as he was eating I also noticed him having difficulty breathing. I took away his food and encouraged him to drink water, and tried massaging from his neck to his belly. His...