Have gone through the same things.  Atrial Fib due to stress.  Learned to manage it.  The people being effected by the layoffs and reorg have been the hardest for me to handle.  I had to take a couple days off to "get back into the game".  My boss understood.  It bothered him too, but he was traveling for a few days when it all happened, and understood I was not handling it well.  I wanted to cry everytime I walked down the hall.  I had to take a break, remove myself from the situation, and get a grip.  After I recharged, I was able to handle it much better.  It was strange for me because I have gone through changes in my career and usually just draw on my inner strength and handle it.  For some reason, this time was different.  That was in November.  Things have calmed down now, and we are still managing changes, but having the support of my boss really meant alot to me.  I was able to return after a couple of days off and assist others in coping with the changes.  You just have to roll with it.  Make sure you are learning all you can so you become a valuable employee.  Also, it benefits you to learn more and keep your skillset up to date in the case budgets are cut and you find you are laid off.  In this economy, no one is safe.