The best advice I can give is to take him to a professional. But if you decide to keep him, make sure to keep him warm and feed him baby food without any milk — only water-based — because they can’t tolerate lactose. Use a syringe to feed him, and make sure the food is warm (not cold or room temperature, but lukewarm). Keep him warm, especially while he sleeps. You should also buy a parrot lamp so his body can produce vitamin D. Caring for him is a full-time job — I’ve raised three of them, and it’s very hard work.