Just set a time window for yourself and give it your best shot. I'd suggest at least a month, if not two. You'll either feel so much better that you will find that it's simply not worth eating those things, or it'll have made little difference and then you can return to your previously scheduled eating routine.
Doing a trial really is the best way to know if you have problems. I tested negative for celiac disease, but going off gluten resolved most of my IBS problems anyway. My understanding of this is that the standard blood test (transglutinase antibody) generally only registers a positive result if you have fairly advanced celiac disease. Milder intolerances may not show up in the lab test, but can still wreak quite a bit of havoc with your health.




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