Welcome to SR Fakeflowers
Definitely have an honest chat with your doctor about your alcohol and anxiety issues. Alcohol only makes anxiety worse in the long run. In the mean time it would be a good idea to keep cutting down what you are drinking.
I would imagine that there will be AA meetings in Japan...I have quite a few Japanese friends and they are all big drinkers! Otherwise I'm sure your doctor would be able to point you in the right direction.
Keep reading and posting here too and I'm sure you'll get lots of help x