betta sick popeye swim bladder lethargic

My Betta fish has popeye and has been lethargic for days. She spends half her time on her side and all around her mouth has turned whitish. I had her on Bettafix, and now she has completed 4 days of erythromycin. Today the popeye became 100% worse. She also hasn't eaten in 6 days. Her water...