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I work primarily with children suffering from asthma and allergies. It can often be very difficult to prove what is causing certain symptoms.

Tests are available both as skin and blood tests. They are supportive at best, but the false negative as well as positive rates are rather high.

Besides, the most important knowledge you will get from a test, is if you find out you are allergic to something that is possible to remove from your environment. For example a dog or cat. Many allergies are not, for example trees and grass. The only thing to do is treat as best possible.

If I were you I would take a pragmatic stance to this and try allergy medicine daily for a week or two. For example some sort of antihistamine tablet. They will only relieve symptoms if the cause is allergic. That way it is diagnostic in some sense.