I agree. Free vet advice from a knowledgable herp vet (Dr.Frye) who has treated many ill frogs, is definitely worth your time.
He helped me save sick adopted red eyes from a local pet store years ago which are doing great. They had bacterial and fungal infections, were dehydrated and not eating. They would have otherwise died.
90% humidity is too high, and can lead to respiratory infections. 70-80% is not too high. Most of the best known breeders actually keep theirs at this routine daily humidity level. They only lower and then raise their humidity for the breeding season. Let's remember that red eyes are not local to the states naturally. They come from the rain forest.
Self-medicating:
Those who have been educated by a qualified vet or have long-term experience in breeding or care of amphibians know what they need to treat. It is best to otherwise follow vet recommendations on ill frog care. It is also best to provide accurate care sooner than later to avoid decline of the frogs health.
Quarantining is alway a good idea. It allows you to monitor well and prevent spread of disease.