[Miko]

Hi buddy I felt so bad after seeing his red eye ,personally I hate when hamsters get such eye or respiratory infections. In my country ,a vet that knows about hamsters is rarely available still I've kept 7 without any advice of vet and all ... Anyways, my hamsters had eye/breathing problems the most and i successfully treated it with Enrofloxacin (also known as Baytril ). Sometimes it even gets worse but as you're giving the right medication I dont think it will get worse, my hamsters used to take about 10 -20 days for the complete recovery so be patient and observe him.
I'd prefer giving him thyme water (boil water with thyme seeds & give him through a syringe when cools down) it will help in breathing. And clean the eye with saline water twice a day.
Observe him for 5 days and if nothing changes, take him to another vet and get some advice.
I hope he recovers soon !!