"A food and symptom journal can be helpful for trying to connect the dots."

This is a good idea, I will try this once I start cutting out foods again.

"High IgE levels can be due to parasitic infections and these have something of a tendency to go underdiagnosed in the US because they get seen as "third world problems."

How does one go about testing this? I visited my gp multiple times and a bunch of tests were taken. Aside from the general itching and rashes, I don't really have other symptoms. Maybe a little fatigue occasionally.