So rare is great news

I received fantastic news this week: I am epilepsy free. Obviously this news is wonderful, but it's hard for me to simply allow myself to be happy about it. There is always something that is threatening my way of life, I feel like I can't even just sit for a minute without something else needing my attention or drawing my worry. Have I simply become unable to appreciate good news when it is given to me? I am concerned for my future happiness if I cannot remember how to appreciate the good things in my life and just let the bad things happen because they can't be stopped.