Hey,
I had the same situation with my hamster (Olive) the other week. She would not stop sneezing and her nose seemed sore, so I took her straight to the vets. They gave me some antibiotics for her water, and I took her wheel out of her cage so she got complete rest for a few days. They told me to take her in incase it was a respiratory infection, because she was also making noises; turns out she was just snoring. But she had caught a cold because my household all had one- while I was away at uni my mam was taking care of her. But now she is back to full health, I made sure I put her on proC probiotic after the meds so she was balanced out. She has returned to being a naughty little hammy, but I wouldn't have her any other way
Hope this helped a little.