I have Multiple Chemical Sensitivites, and Candida. Every drug brings out symptoms in me, and not wanting to live that way anymore is the reason I decided to research the drugs I was on, and if it were possible to stop taking them. The atenelol was hard to stop. I had to cut it in half, and after several weeks, in quarters, and the original pill was 25 mgs. The first two to three days off of it, I had heart palputations, and felt very weak. I felt I had no choice if I wanted to get better, so I took the chance. It's not something I would suggest doing. None of my doctors would help me with it.
You might want to research beta blockers to see what they do.