Allergy Shots: How to Know When You're Done?

I've been doing allergy shots for a few years now (a little over 4 years), and I'm wondering: how do you know when it's time to quit?

I still have reactions to shots, but nothing major: a knot on the arm with the worst of my allergens when I get shots, and feel a little wheezy day of shots. Beyond that, no real reaction.

Do I still have reactions to my outside environment? Yes! But I take allergy meds. I never had allergies that were horrible, in terms of a regular sniffly nose or watery eyes. My issue was just post-nasal drip and ear issues (I would get periodic ear infections due to chronic inflammation). I don't want to stop allergy meds just to test that this is "better," but I don't know how else allergy shot progress is assessed.