I've been experiencing heart palpitations almost daily for the last three weeks. They're not necessarily skipped beats or a fluttering feeling, it's more that my heart is beating harder and faster than usual; almost a throbbing or thumping sort of feeling. It's pretty much a constant occurrence, and extremely unsettling. I very often have trouble focusing on anything because it can be very physically uncomfortable. It's almost as if my body is in a hyper state of being all the time, like you're engaged in a heated debate, or waiting to go in for a job interview; but all the time. I've also developed a fairly regular cough that very much seems to be correlated with this as well as painless muscle spasms or twitches all over, but no chest pain and not feeling lightheaded. I don't smoke, don't drink excessive caffeine and definitely do not have any type of anxiety and do not feel overly stressed. Still this is quite frightening and more than anything I just want relief from it so I can get back to regular life. I went to the doctor and received an EKG and blood work which were both normal. I was put on a 24 hour monitor which showed bits of sinus tachycardia but nothing more. Was put on a small dose of a beta blocker but to no avail. I also read that being magnesium deficient might cause these symptoms so I began taking a supplement everyday which also didn't prove successful. I have a follow up appointment in a few days and am petrified that my doctor will again say that it is just anxiety, even though the only thing making me anxious at all is the symptoms I've been experiencing. ANY insights about this (aside from telling me that I simply need to remove stress from my life) would be GREATLY appreciated. For reference, I'm a 24 year old guy who is otherwise healthy.