Alright... Sparkle has been sneezing and gaping for about 2wks now. There is no discharge from her nostrils. I wormed her 10 days ago and dosed her again tonight with ivermectrin (horse paste - it's what I have on hand). She didn't get any better, but is getting worse. She acts like there is something stuck in her throat and can't breathe. I noticed today she was sitting kind of hunched up and tonight her crop is empty (which is unusual). As you can see in the pictures, her comb and wattles are turning black, too. I have checked for bugs and haven't seen any, so I am wondering now if her comb isn't turning black because of lack of oxygen. What should I do now?