Have you been checked for dust or mold allergy? Even if very mild, it can cause lots of problems, and because it is everywhere,and bother you even while sleeping. It is something that you would be bothered by in any country you are in, all year round. Allergy shots do help, and my dust allergy is much reduced after doing the shots for 4 years. I expect it to be gone after another couple years of shots. My mold allergies, of which I had 3, are completely gone now. Allergy shots are not like immunizations, but are more of a homeopathic sort of treatment.
Also, I have read that gall bladder cleansing can reduce allergies. Your liver health affects your allergies.