Hello everyone,
We took him to the vet and she was very good with him,
The vets flushed out his crop and it returned to normal, they also gave him some antibiotics and gave us some to give him over five days along with a prescription for anti-fungal medicine to give him.
He's home now and had some food, the vet suggested that we use a feeding spoon instead of a syringe without a needle.
He is still looking lively although he has lost weight and is very hungry although not dehydrated.
We will feed him little and often and hopefully his condition will improve, I think he might be OK.
Thank you for every ones advise, I'll update if anything else happens with him.