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Hello, JACustomer. I have been a Veterinary Nurse for over 15 years and would be happy to help you today. I'm reviewing your question right now.
Can you post a picture of the eye that is causing him problems?
Forgive me, it sounded like there was an eye concern when you stated "and he just about opens his eyes". Aside from the hiding, are you seeing any other obvious signs? Any coughing or sneezing? Nasal discharge? Is he 5.5 weeks old or 5.5 months? Is he still eating and drinking normally, without change? Using the litter box normally?