Hi,
I would like to recommend you to try the clinical hypnotherapy method to improve your gastrointestinal symptoms.
The Traditional and Complementary Medicine Act (Act 756) sets the minimum competence level for the credentialing of a professional Mind Body Soul Therapy practitioner in Malaysia.
Look for a registered and licensed clinical hypnotherapist under the Association of Hypnotherapy Practitioners, Malaysia (AHPM) which is the governing body for hypnotherapy.

The Efficacy of Hypnotherapy in the Treatment of Irritable Bowel Syndrome: A Systematic Review and Meta-analysis
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4015203/
The outcomes in this meta-analysis were evaluated at 3 months for short-term effects and at 1 year for long-term effects. The change in abdominal pain score at 3 months was significant in the hypnotherapy group (standardized mean difference, −0.83; 95% CI, −1.65 to −0.01). Three of the 4 trials showed greater improvement in overall gastrointestinal symptoms in the hypnotherapy group.

Conclusions
This study provides clearer evidence that hypnotherapy has beneficial short-term effects in improving gastrointestinal symptoms of patients with IBS.