I read a book called The Instinct To Heal and it talks about how the inner part of our brain is our emotional brain. So yes our emotions are directly connected to our physical bodies. However anxiety will NOT cause death. Us people with a/p seem to be overly sensitive and so our bodies react to our emotions instantly. What I am trying to do is reprogram my thoughts so I don't automatically think the worst. I try to do this by catching myself thinking negatively and I say to myself stop. Only positive thoughts, CBT has really been my backbone for this. I have a free online CBT course that someone has sent me and I have had to adjust it a little according to my anxieties, but it has been a great help to me and I will send it to you if you would like me to. Just e-mail me, my address is in my profile and I will forward what I have to you gladly.
"Happiness is your nature. It is not wrong to desire it, what is wrong is seeking it outside when it is inside." -Ramana Maharishi
"Mind is the source of happiness or unhappiness".-Buddha