@donasmrs-- A caffeine allergy can show itself in psychological symptoms in addition to physical symptoms. I am allergic to caffeine and the major reaction I develop is depression and anxiety. Caffeine makes me feel detached, upset and moody and it usually takes days for me to get over it.
And the more caffeine, I have, the worse I get. The caffeinated energy drinks are the worst, they turn me into a mental patient.