I am your neighbor now, living in Taiwan. Has it been as cold in Japan as in Taiwan during the past few weeks ? Yuck! Cold and humid, ideal weather for candida to proliferate.
You want to know that
ACV comes in two forms: pasteurized and non pasteurized (in Taiwan I could only find the pasteurize ACV, which does too). The very best is the non-pasterurized ACV. On the bottle, it will either say 'non-pasteurized' or "with the mother".