You are right. I was consuming large amounts of caffeine. Usually 4 to 5 espressos per day, 0.5L of filter coffee, plus large amounts of beer on Friday and Saturday nights. At that time, I was in a gym, 3 to 4 times per week. I was told, by the doctor, that it would help me to clear my mind from work. Regarding medication, I was consuming some vitamins.