Hi, 2 weeks ago Saturday afternoon I was sitting on the couch relaxing and was feeling a little tired. At the time I had been drinking one 5 hour energy shot every day. Well that day I drank the shot and about a half hour later I noticed I was feeling jittery. Shortly after that I seemed to have panicked and scared myself. So since that day I haven t touched 5 hour energy. After that episode that s all that was on my mind. It has happened 3 other times where I seemed to have a panic attack or anxiety? I spoke with my pcp and he thinks it was anxiety. However since then I notice I have a rumbling in my stomach and sometimes seems like the rumbling is in my chest and it scares me I almost get a little dizzy feeling for a split second and takes my breath away. This rumbling I have only seems to occur if I am in the sitting position. I am 35 years old and have an athletic build. I m just nervous it has something to do with my heart. When I saw my doctor my blood pressure and oxygen levels were perfect. And ideas?