I live in New Zealand. I have the same experience as you, before.
Try drink a herbal tea " St John's Wort " that will easy your nerve and feel good with your stomach within 10 min.
Hope you can find it in Taiwan.
德國草藥─聖約翰草(St John's wort),具有抗焦慮、幫助睡眠等效能,一直是美國銷售 排行榜上前幾名