I don't think it'd be ammonia if they're not currently housed in that same place. (Though, really...never say never!)
Hopefully, you should see some more improvement tomorrow. On ones I have treated, if the treatment is working, the second day (after two treatments, I was using Tylan 50 and giving it by syringe to each bird at night after they'd gone to roost), was the most noticeable improvement. Maybe VERY slight the first 24 hours... but, by the morning after the second dose, they were very much improved.
Wazine will get roundworms. It's a good thing to use if you have never dewormed them before. It won't kill any other worms.
After they get better, use the wazine as directed... and then follow that up with ivomec or safeguard about 10 days to 2 weeks later. There is ivomec pour on (for cattle) that can be dosed on their skin-- several drops (and up) depending on size of bird. Safeguard paste (horse dewormer) can be given orally... a small BB sized dose. (easiest to dispense on finger, then scrape into beak, IMO) I think you can mix ivomec INJECTABLE into drinking water, but it doesn't mix well and needs to be shaken/renewed several times a day to keep it mixed.
REALLY, really check them for lice/mites, too. I had some infested with one or the other..or both...and missed it the first times I checked. They were extremely small critters... smaller than I thought. I needed bright lighting and had to part the feathes in just the right places to search. I actually had someone hold the bird for me, hiney up in the air, so I could really part the feathers and search/look for the tiny little specks. Around the vent/up into the tail feathers was the easiest place to find them once I knew what I was looking for. Some of these can be killed using ivomec, but some don't actually suck the blood, but eat on dead skin cells and feathers. Dusting works best on those... since they don't *bite* to get dosed with systematic meds. I read in an article that listed the seriousness of the infestation by how many of the critters you could count... I think it was that if you count 5 or 6, it's considered moderately severe, etc. From what I understand, they can also take birds down pretty quickly.
Won't necessarily give you respiratory symptoms (or odd poop), but the last thing you need is something compounding the problem and draining them quicker.
AND... I'm with you... I always thought horses were finicky creatures and could kill themselves with a Q-tip! I've not had NEARLY the issues with horses all my life that I've had with chickens in a VERY short time. Guess I was terribly unlucky with them from the get go!
