Seems a tough decision.....is there an appeal process? Can you get that restriction removed at a later date? i.e. after you have proven youre flying abilities are ok and get your instructor to write a letter.
Explore all the options. Its only the first hurdle!
Not expert advice but hope this helps. Suggest for expert advice you seek second opinions from AMEs (authorised medical examiners) in malaysia who may have seen similar cases.