I thought one of the birds was breathing bad. Did the Doc say anything about that? I am glad you finally went to the vet.
I am relatively new to birds myself but when I bought Bob I knew the commitment I was making. Animals rely on us exclusively and cannot eat better food, get medical attention when they need it or even make friends outside of their environment. They depend on us to provide all their needs, I don't care if its a bird, a snake, a dog, a cat, any living creature we domesticate.
I am glad you followed through and sought medical attention for your birds. The one suggestion I think you should consider is reading all the threads regarding food and nutrition. We are what we eat and same for birds.
To get your birds back on their game again, feed them the best seed and grains you can afford and include veggies like broccoli, green leafy veggies and herbs and spices. You can see a difference in days.
Good luck to you and keep posting. No one on this site is trying to be mean to you but they just really care about the birds.