I found that potassium gives me anxiety and panic attacks. I noticed this after drinking an electrolyte drink, and also eventually traced it back to fish and to chicken broth, both of which are high in potassium.

I now eat a low-potassium diet, which fixed the problem.

My potassium levels are normal. My doctors have never heard of this effect. I can't explain this, I just know it works for me, and I have some confidence from looking back at my food logs that it's not a placebo effect.