I am so sorry for your problems with your little one, & I wish I knew something that would help.
My Java (as in coffee, not the species, just a name) is fine & no signs of infection setting in so far, still keeping a close eye on him. Still never found out where he got that piece of flight nettting from, either. I've looked everywhere. I perused the parrot aisle in
PetSmart this morning to get some ideas for toys to build for them tomorrow. They are way too inquisitive for their own good & need entertainment. Love 'em! our mail carrier had to drive all the way down our long driveway so she could meet them today.
It seems like it was having problems even before you dosed them w/the Ivermectrin, is that right? in which case, that is not the factor
here.... I just don't know-- my chick could not eat or drink w/a gullet full of netting, but I still wonder if yours did not swallow something it should not have-- I think, if it were mine, I would do the olive oil treatment & hope that whatever it is passes from its' system.
Unless somebody here who is experienced w/peafowl has other ideas -- wish they would chime in--- come on guys! we need help here!
Do you have a local zoo, and if so, can you call them & ask who their exotic animal vet is & call & ask for advice from them?