To test the effect of coffee on me, I made much coffee this moring exceptionally. Drank a mug of coffee after brunch and another one almost three hours later. However, it is still quicken my heart beat and I can't calm down to do RC. I know I can't drink coffee with empty stomach, but didn't expect 2 mugs are too much for me even after meals.
Just reminder other members to try any stimulants in advance in case any side effect occurs.