Along with his possible PDD issue consider food allergies. My B&G has kidney disease & can no longer eat any pistachios or she vomits. Eating just one pistachio can throw her into several bad days in a row. It's like a major flare up.
Equa Holistics makes a dairy free probiotic for parrots. I use this on my B&G Macaw. You can sprinkle it on food or mix it in soft foods like unsweetened apple sauce, mashed sweet potatoes, etc.: Amazon.com : HealthyGut Avian Probiotics | 120 Servings | Dairy Free : Pet Supplies This really helps her when she vomits or is having bad days.
Camomile Tea helps to calm the stomach as well.
Equa Holistics makes a dairy free probiotic for parrots. I use this on my B&G Macaw. You can sprinkle it on food or mix it in soft foods like unsweetened apple sauce, mashed sweet potatoes, etc.: Amazon.com : HealthyGut Avian Probiotics | 120 Servings | Dairy Free : Pet Supplies This really helps her when she vomits or is having bad days.
Camomile Tea helps to calm the stomach as well.