Hi 123
Welcome to the forum!
I'm glad that you decided to join us even though it's because your fish are in trouble. Our members will do all they can to help you, but it will make things easier if you update your profile to include your location and some information about the size tank and the fish you already have. We are a worldwide forum and if you tell us where you are, the members might even be able to recommend a medicine that is sold in your country, if one is indicated.
I hope you will resolve your problem quickly and stay around and use your experience to help others too.
Good luck with your sick fishies.