I've drink coffee many times, from the light one to the heavy one. Usually I drink the light one (such as instant coffee) and medium one (like caffe latte and such) and those never did anything to me, only sometimes my heart beats a little faster than before. And I still able to sleep at night, even when once I ever drink the heavy one. But yesterday, only a simple milk coffee that I bought totally makes me feels bad. My heart beats so fast until my body also shaken. My feeling becomes uneasy, negative thought keep flashing on my head, my stomach is like being filled up with air like a balloon. Cold sweats flowing in my palm, and my whole body. And worst, for the first time I literally can't sleep at all last night. My eyes were heavy but my mind was conscious. Definitely not a good feeling. And yeah, this is the first time a coffee affected me so bad