Welcome to EBN.
I would suggest another vet and before going in asking them if they no anything about bullies. It surely can't go on like this. Have you tried going even a day without the meds? Do they work at all? Are you really just throwing away your money?
I always think that it would be better to know why this is happening instead of just trying to take care of the symptoms. Food plays a big role in bullies health too, yes even eye health. What are you feeding her?