I took my 20mg addy at 2pm, which I am prescribed. I stupidly drank 3 monsters in a period of about 3 hours, for a total of 489mg of caffeine in this time frame, and apparently 500mg in a day is bad for you. My heart rate rocketed to around 125-130 bpm about 2 hours ago, but now it is still at 105-115 bpm, and my addy is wearing off at this point, and I plan on taking an addition 20mg at 10 or 11 pm if my heart rate goes down to 70 or so, then taking it again around 2pm tomm(I have a test I need to stay up for). I have 2 cans of monster left, but I am scared to drink them. I have only eaten grilled chicken, 2-3 bananas a day, crackers, and a multivitamin the past 4 days, but apparently high potassium causes tachycardia as well. Honestly need help in deciding my next move, I cant study atm without my adderall unfortunately, and my heart rate is really scaring me.