anxiety
"I have been taking the generic Tenormin (atenenol) for probably 32 years now.  25 mg.  I take it at night.  Never had a problem, EXCEPT when I could not see my doctor and had to see someone else in the practice.  He thought I should get off the drug; said there were new better things.  He took me off it and I was going on vacation the next day or so.  Worse vacation ever.  I thought I was dying.  My heart was pounding.  I thought I would die up in the mountains.  Got back on Atenol when I got back home.  Everything was normal.  If I accidently miss a day or so, I can tell the difference.  I don't know about all the side effects other people have had, but it works great for me."