For me it was palpitations from 5-HTP. Heart skips a beat, then sudden extreme vertigo and anxiety skyrockets. This happened several times a day. And magnesium

For me it was palpitations from 5-HTP. Heart skips a beat, then sudden extreme vertigo and anxiety skyrockets. This happened several times a day. And magnesium caused a dull, ever-present pressure/ache in the left side of my chest that went mostly away (except when I'm very anxious) after I stopped taking it.