Hello. I am new to this site, but joined so I could find other people to talk to who may be going through the same thing. I am also in the medical field which doesn't help my situation! For the past few months, I have been having more frequent palpitations and I am currently going through a series of tests to find out the cause. I was on Atenolol for years to treat my high blood pressure and when the palpitations began, I was switched to toprol 100mg. This helped some but not completely. I told my doctor about this, and I was then told to take diltiazem 180mg. Yesterday was my first day on this new med and my symptoms are much worse. My heart has been racing and pounding and it is driving me crazy. I try to remain calm, but I think I am so aware of what my heart is doing that I find it hard to remain calm. Any advice? Anyone gong through the same thing?