I've had this for years. On an empty stomach, my heart rate is normal. When I eat a meal (it could be anything, from a bowl of oatmeat to a scoop of whey protein), my heart starts beating really fast. I will have to drink a lot of water over the course of several minutes in order to get it down and feel normal again. Supplements help get rid of this - ashwaghanda, l-theanine, rhodiola. If I don't take any of these supplements it is really bad. For instance, before I started taking supplements, I would eat a meal and my heart rate would take hours to come down to normal, I would drink nearly 2 gallons of water per day and always feel like I needed more water. Alcohol exacerbates this effect. If I even drink 1 beer I will need at least 1 glass of water to bring my heart rate down - that is unless I drink several shots of hard liqueur then I will become calm. The day after drinking is the worst, anxiety and heart rate will be really bad.
I've told my doctor about all of this and had my blood tested, he said everything is normal and prescribed me paxil (which I never took). I took the Bravermen test, and GABA was my weak point. Am I experience generalized anxiety disorder, or is there more to it? I don't understand why water helps, and why it is worst after eating food.