Actually, my downward health spiral started around 10 years ago with mild sinus congestion. I had what seemed like a low grade "hayfever" type of reaction all the time. In my younger years I never had any allergies or sinus issues.
I went to see an integrative medicine doc at the time and he gave a dx of sinusitus. He also ran a food allergy panel that showed a number of IgG allergens.
I still the mild sinusitus to this day. It hasn't really changed much over time (maybe just a hair worse than 10 years ago). What started all of this, I still don't know.