Hi Emily,
I'm sorry that your fish is sick. How awful to come home to a sick fish after treating a sick parent. I hope your parent is doing better after your visit.
I'm not a fish expert, so I can't offer you any advice. I'm sure someone will be on soon to help you out. It would help them a great deal if you had the water test results - in numbers - so they can see what exactly is going on with the tank.
I wish you all the best with your fish for a speedy recovery. It's so painful to see your pet ill, and not know what to do. We've all been there... that's how we found Koko's.
Good luck with your fish!
Debbie