Lilypad, I am sorry to read that you are having having such a hard time with the medications we are suggesting. Unfortunately medications have different (and dissimilar) names in different countries.
I hope you figure out what's going on with your hens and hopefully they will recover.
I...
If you are confident of the does you gave and there isn't any improvement with flubenvet that your hens might have a respiratory infection.
See if there is a vet that treats exotic birds in your area. He/she would at least be able to prescribe the proper type and dosage of antibiotics.