I think i got glutened?

So, there's a local bakery that is vegan and gluten-free. They have a completely separate gluten-free kitchen, but their baked goods are sold in the same little display area as the gluten goods.

I had one of their gluten-free treats and it was this delicious oat date bar. Immediately though i had stomach cramping, joint pain,some anxiety and this morning my tinnitus is back and I feel like I have an outer ear infection again. le sigh. So I'm wondering if I'm having a reaction because of the oats or the potential cross-contact? I'm also, as I'm writing this, wondering if they use gluten-free oats. I never thought to ask.

Great learning curve, I guess. Now I know better what questions to ask. I don't know if I should risk it again with a non-oat treat or if I should just leave it alone. What would you do?