Hi, it has been a long time since I have posted here, I have anxiety problems and now I am finding out my Dad has them! He is in the Hospital right now with complications from a lung cancer surgery he had 2 months ago, he is 70 years old and my question is a tough one I think? I have suspected that he has been having panic attacks for a couple years now, the first time I was acually there with him in the emergency room and they were doing an ekg on him and I went in for one when I had panic attacks which is why I recognized a similarity, the Docs diagnosed him with Atrial fibrilation, I am wandering if a panic attack could simulate atrial fibrilation? He had a heart attack when he was 40 and has also been diagnosed with congenital heart failure, since he was hospitalized again after being out for about a week I noticed today that he was VERY shaky and it seemed like his leg would twitch on him uncontrollably, like an involantary small kicking type motion. he is taking like 20 differrent meds and they have recently put him on Xanax and not for sure but was on Prozac for depression for awhile, can either Prozac or Xanax cause him to shake like that and his leg twitches? I had a really bad day today worrying about the state I saw him in , would greatly appreciate any help with my questions that anyone may have? Thanks!