I am 19 years old and last week on Friday I was rushed to the Emergency Room for symptoms I was experiencing from an overdose on espresso. When I arrived I was told I was experiencing "tachycardia". My heart rate was beating over 100. I was at bed-rest and given a pill. However I am still experiencing tachycardia symptoms (not currently at hospital).
I was also told that I was underweight and that caffeine overdose will impact me harder than others. Should I just keep drinking more water if the caffeine is not finished flushing out of my body? How long will it take for the caffeine to be out of my system?
I am worried that I need to see a cardiologist. Also, is it possible for caffeine overdose to permanently damage my heart?