Hey there - just saw your post about your LO - sorry to hear he's got pneumonia, too
We took Will to the dr. yesterday, and got that diagnosis after she heard the symptoms and listened to his breathing. She prescribed amoxicillin and told us to be sure to use his nebulizer (with albuterol) at least twice a day. He already had that because of wheezing he's had before.
He's had the meds now for about 36 hours, and seems to be feeling better. Appetite isn't TOTALLY back to normal, and there's still some lingering diarrhea (yuck!), but the coughing isn't as bad, and he's back to playing etc.
We didn't get any advice on percussive treatment...but yeah, I wouldn't see that happening with my little dude, either!
Good luck - hope your LO feels better soon!!