I just saw this threat too and I am so glad he is doing better. I know how worrying it is when your little feathered friend isn't well. Mine isn't well at the moment. I don't know if this will help but my Vet advised me to feed my 'tiel with baby food in a syringe when he wasn't eating. He wasn't overly impressed but it did get some food into him.
You're doing really well with your bird and fingers crossed for a speedy recovery.