this is just my opinion, but fooling around with parasites picked up overseas is no joke and should not be relegated simply to the halls of alternative medicine and candida diets.... (not that I don't believe in candida - i do. I KNOW i have candidia and i DO get die-off).
i think you may have picked up a bug in Asia - it happens. We don't grow up with their parasites and bugs and don't have good immune responses to them etc. so they become chronic.
I have a friend in NY who used to get terrible gastritis attacks, leaving her doubled over in pain from various foods. Her lists of "safe" foods got smaller and smaller and smaller until there was very little she could eat - long story short - she went to see Dr. Leo Galland in NYC who traced the onset of her gastritis attacks to a trip to Mexico. He did some aggressive testing at some very good lab and found the bug she had picked up - prescribed the correct Antibiotic - and bingo, no more gastric attacks...
I have another friend who took a trip on the Nile and came back with all sorts of intestinal problems - she got skinnier and skinner. The doctors here told her she was "bulimic" and "nervous" and tried to get her mental help. Her parents got desperate and took her to a doctor versed in tropical medicine... bingo - amoebic dysentary caused by e. hystolitica.
I have been reading up a little on parasitology. Most standard labs are absolutely hopeless at picking up even the most common bugs (the NIH regularly test labs by sending them anonymous samples deliberately infected with different bugs - and most labs failure rates run close to 90% - even the "good" labs like GSDL, miss a lot of the bugs).
your general practitioner and standard tests will be of no use. get him or her to refer you to an infectious disease specialist or go to see Dr. Galland in NY - he's really good at finding bugs. you could get really lucky and they could find the bug and you could get the right treatment and bingo - no more "allergies"