He is breathing heavy and refusing to eat or drink and as no energy
It sounds like your cat is experiencing some very concerning symptoms, such as heavy breathing, refusal to eat or drink, and a lack of energy. These signs can indicate serious health issues, including respiratory infections, heart disease, or even a foreign object obstructing the airway.
Given that these symptoms have persisted for three days and appear to be severe, it is imperative to seek immediate veterinary care. Heavy breathing and lethargy can be indicative of respiratory distress or other critical conditions that require prompt medical attention.
In the meantime, you can try to keep your cat comfortable by providing a calm and quiet environment. If you have a humidifier, using it might help ease any potential respiratory discomfort. However, please remember that these are only temporary measures, and a professional evaluation is necessary.
I strongly recommend taking your cat to the nearest veterinary clinic or emergency animal hospital as soon as possible to ensure they receive the appropriate care.
If you have any further questions, please feel free to ask. Thank you.