I'm going throuh the same thing. I was taking 75 mg of atenolol, and my heart rate was going into the 50's and I felt dizzy and nauseated. My Dr. has me taking 12.5 mg of atenolol now, my heart rate is back into the 60s, but that's where mine usually stays however I feel much better when it's in the 70s. My heart palps have increased dramatically since cutting my dosage, it's scaring me. I have an appt on Tuesday to see exactly what's going on. Hang in there. I find that getting up an moving around helps me a lot, even a stroll around the block makes me feel a little better. Take care.