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You are through to Dr Coles. I am a UK based vet. I am sorry to hear you are having problems with your bird. Birds are very good at hiding symptoms of illness, so any change in demeanour is quite concerning and usually suggestive that they are very unwell. Birds have a very fast metabolism so if they are not eating they lose weight very quickly and do tend to deteriorate. The eye being closed could be specifically an issue with that eye (e.g conjunctivitis, sinusitis) or it could just be him being/feeling lethargic and holding the eyes shut/fluffed up. Conjunctivitis and sinusitis are often secondary to more systemic issues/respiratory infections. I would advise that you contact your emergency vets to have him seen tonight and I would not advise waiting until tomorrow. He likely will need antibiotics/anti inflammatories and he needs the eye examined to check for any scratches/foreign material etc. I would keep him somewhere warmer than usual, with easy access to food/water and can offer treat items to encourage him to eat. If you have any avipro avian or guardian angel I would advise adding this to his water now.