Diltiazem
"Hi,  I had an attack of tachycardia that was caused by eating apricot seeds. Taken to the hospital and treated for 125-135 heart and feeling like I was shaking and panicking. They prescribed Metoprolol and sent me home after treatment, I felt fine the next day and then had rapid heart rate again and had a flash of anxiety. I took the metoprolol and tried to get in to see my Army doctors. After a 10 day wait and being extremely anxious and a nervous wreck I got to see my doctor. He took me off Metoprolol and gave me Diltiazem, no blood tests, no other testing. The Diltiazem makes me feel foggy, dizzy, and at first chest tightness and palpitations. I'm desperately working out to lose weight and get off this drug."