My feeling is it either does nothing at a low does but does make me feel anxious when drinking, an uneasy feeling in my chest. I don't have that problem with e

My feeling is it either does nothing at a low does but does make me feel anxious when drinking, an uneasy feeling in my chest. I don't have that problem with energy drinks (even it is the caffeine equivalent of something like 8 espressos) and tea (hasn't happened ever and I drink a lot of tea)