What you are describing definately sounds like MG... puffy bubbly/fizzy eyes, nasal drainage, making motions or sounds like they are choking (stretching out neck and gaping mouth open) are all very big signs of MG.
Honestly if you got your chickens for meat and eggs I would say cull as MG infected birds even when the active infection has passed when they become 'carriers' they lay very poorly...Also any new birds you introduce to your home will become infected as well...
If these are simply pets and eggs do not matter - give them a solid 10 days of antibiotics do not eat any eggs during treatment and for 2 weeks after last day of treatment.
I just want to wisely advice you that your birds will probably get over this (except maybe the bubbly eye - that can stick around after all other symptoms are past) and seem perfectly fine, but they will carry the disease in their bodies and shed it in their feces and dander to spread to any other birds that come in contact with it...So any new birds will likely contract the disease upon coming onto your property and will likely get actively sick with the symptoms...Chicks are more likely to die from respitory illnesses like MG, so I would never add new young chicks to your existing flock in the future.
MG carriers can live perfectly normal chicken lives, however sometimes the symptoms of the disease can crop back up from time to time...
I only seriously stress that you are careful about where you go after you have had contact with your birds...I want to advise you if you go somewhere with other chickens or poultry to not wear shoes to wear in your chicken pen, and change clothes if you've handled your chickens and going to another location...This is to protect someone else's animals from contracting what yours have.
Good luck
