well if you are the superstitious type then go ask from some bomoh or temple medium

back on track. It could be allergy also. you may need to do test on his food. My doctor once thought me.

first you will have to filter out all food & keep a record.

EG: give him only eggs for few days and see any changes. then next add on 2nd time.. and so on. Its a long process but you will need to know if there is allergy issue

other than food, check around for any environment allergy causes too.

my small one also have been sick frequently and we decided to give me consistent pro-biotics & protein and there is great improvement to her health now.

hope this helps. and all the best