anxiety
"I have acute panic disorder. I was on SSRI's for a while but they did not work for me to stop the attacks. My doctor decided to put me on Lorazapem. It did stop my panic attacks very well and I started to feel good for a while, I was taking 0.5mg every day. About a year after I had developed a faster heart rate during my panic attacks and I started seeing my pulse pounding on my neck.  I still used it and thought that it was probably a new health condition. After going to several cardiac test, nothing was found wrong with my heart.
I read a message at a discussion board one day.
Ativan may cause rapid heart rate, a pounding pulse on the neck and chest. I stopped taking it and switched to Xanax. All my symptoms went away."