Your best bet would be to seek out a Sport Medicine doctor in Singapore, who are able to advice you on nutrition, weight loss and exercise, as well as to link you up with a dietitian if necessary.
Even though I’m partial towards low carbs/high protein myself, I can’t advocate a diet that’s high in fat (nor would most other doctors) due to the associated heart disease risks.
It’s important to seek out a doctor regarding your new heart palpitations to determine the cause, as an ECG is an simple test that can help your doctor screen for and rule out insidious conditions.
Cheers