Could be a lot of things. You'll get a lot of unqualified opinions here but the doctor is your best bet. Having said that, I'm going to throw my own unqualified opinion into the ring.
Anemia is a possibility, depending on the diet. I don't know what the japanese diet is like nutritionally speaking, so I can't say whether low iron levels are a possibility. Also could be hypothyroid, that can cause fatigue and weight loss. Then again, so can diabetes.
Have you been getting a good night's rest every night? That could easily be it too. Lack of sleep will cause a fatigued feeling (obviously) but will also cause weight loss and funny aches and pains that aren't present normally. It's your body's way of telling you that you need to sleep right effing now. The weight loss is due to eating less, as your appetite will shrink when you don't get enough sleep.
So, yeah. Bloodwork is the word of the day. You need a full gamut of tests to determine what out of approximately 8 billion possible causes is the one that's giving you grief. Take heart, though. For every diabetic, there's about 50 people who just don't have enough iron in their diet.
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I wake up in the morning more tired than before I slept
I get through cryin' and I'm sadder than before I wept
I get through thinkin' now, and the thoughts have left my head
I get through speakin' and I can't remember, not a word that I said
- Ben Harper, Show Me A Little Shame
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