Sounds like you picked up a parasite in Asia like I did.
You probably killed off a big one and they went into hibernation. But there were some eggs somewhere that re-hatched when you went back to your regular diet.
I would suggest you get NAET or Bioset to try and re-train your immune system to deal with the parasites.
If you stay on the diet you are on I would just suggest a couple of things.
1. That you take a b-12 supplement if you are not eating much meat and dairy. Especially since the parasite interfere with digestion.
2. Be careful with the fish, because of the mercury content. Maybe stick with low mercury fish, like sardines or wild salmon.