Am I crazy? Mood swings from gluten?

Hi. I’ve been tested for a gluten allergy more than once but it comes back negative. But I’m convinced that I get severe mood swings from eating gluten. Is that even possible? I don’t really get stomach problems or other symptoms except for some nausea. But if I eat a lot of gluten like a sandwich or pasta I feel so irritated, sad, and anxious the next day. This should not be possible as I don’t have an allergy right? And from what I understand symptoms are more physical rather than psychological?

I don’t have health anxiety or food issues or anything like that, so I don’t think it’s just me over analyzing. It’s just too consistent to be a coincidence.

Is it possible to get these symptoms without an allergy? Or am I missing something?

Thanks and I hope I’m not offending anyone with this, obviously celiac’s disease is way worse than what I’m experiencing.