Great! I'm glad you have started some research on MG.This fella is to spend his days with the ladies....The MG does look like it can be it. After the replies, I looked it up. Symptoms does fit. Now to treating it. Like I mentioned I already gave him a few droplets of vetRX. This is what the guys at the feed store recommended for all respiratory problems. But is there anything else I can try?
I suppose you did read that there is no cure, the disease is communicable, birds are carriers for life, it's transmitted on dust/dander and it can also be transmitted into eggs as well (one of the few that is transmitted both vertically and horizontally). You may find this helpful.
https://extension.umd.edu/sites/ext... Mycoplasma gallisepticum (MG) Infecti....pdf
I would try to get some Tylosin if possible and see if that helps. Hopefully you can get some.