It's important to do that. You're only one human being. You can only do what you can do - you can't do more than that. Events usually have a life of their own - beyond our control. Try to plan as best you can - but you can't plan for everything.
Unexpected things do happen.
It's not your fault. No one's got it as bad as I do, etc. For that kind of issue - you need all the help you can get. This is crucial when dealing with a truly tough situation. When you're under stress, be sure to eat healthy food - not junk food.