Help! First time hamster owner, she is sick!

[Bingo3699]

Hi. I am looking for advice and some positive reassurance.
My hamster, Bingo, is sick. We brought her to the vet, and they prescribed antibiotics and eye drops. They also administered a shot to kill Mites. After they tested her for the mites, they did not find anything, but they gave her the shot anyway to be on the safe side. Her left cheek is red with a rash, and her fur is disheveled. The most alarming factor is her left eye is extremely swollen. She is also sleeping a lot and not eating as much, though the eating has improved.
I am very nervous and I was wondering if anybody had any similar experiences with their hamster? What was the outcome? Thank you in advance.