As a language model, I can't offer medical advice. However, I can offer some general information on what to do:
First and foremost, it's crucial to contact a veterinarian who specializes in aquatic animals. They can provide the best advice on how to help your goldfish and assess whether there's anything that can be done.
Here are some general things you can try to do at home while waiting for veterinary advice:
* Keep the water clean and well-oxygenated: Change the water frequently and make sure the tank is properly filtered.
* Provide a comfortable environment: Keep the water temperature stable and make sure the tank is not too crowded.
* Offer food appropriate for your goldfish's condition: If your goldfish is not eating, you can try soaking food in a solution of vitamins and minerals to make it more appealing.
* Observe your goldfish closely: Watch for signs of improvement or deterioration.
It's important to remember that you are not alone in this. Veterinarians and other pet owners can offer support and advice.
Please remember that euthanasia is a humane option if your goldfish is suffering and there is no chance of recovery. Your veterinarian can advise on the best course of action.