Blessing in Disguise?

After working 13 years for a company, I was "let go" last month.  At first I was ok, but as the realization sunk in (I have never been fired before) I had a melt down.  They're reasoning was that I had missed too much work, I have severe migraines and am under a neurologists care and they know it.  I was always considered the best in our department so everyone was in shock when this happened.  I believe I was used as a scapegoat because the economy is so bad and the dept was not making their numbers that one had to go.  I am (was) third in line below the 2 top managers so I got it.  I feel like a failure, my migraines have slowed down considerably (I'm not bringing work home anylonger) but I'm so depressed because how am I going to find another job since the economy is so bad now?  I did get my unemployment because they didn't really have a good enough reason to fire me since they knew about the migraines and I had excuses everytime.  I'm very concerned about our finances and my future, I am 52 and scared to death to do anything but what I have been doing all along....