I think I'm crazy!

I can't stop crying.  I've gone back to work this week...working as many hours as I feel able to each day.  Yesterday I left at 2:45 because I was just wiped out.  Last night I took something to help me sleep because I just having been sleeping well lately. 
But I can't stop crying.  I feel so tired and sad.  I have to keep calling doctor's offices and getting referrals and having tests.  I'm tired of it.  I'm afraid all the time.  I feel so overwhelmed by everything.
In addition to the PE's I discovered that I'm pre-diabetic.  I feel paralyzed with fear and overloaded with information.  I don't know where to start and I'm afraid that if I don't DO SOMETHING to take care of my health I'm going to die.  I'm afraid of everything spinning out of control. 
I'm single and most of my friends live far away.  I need help managing everything from my health to my finances.  I'm just so overwhelmed and I feel stupid because I should be able to handle things.  I'm a grown woman and I should be able to take control and get it together.
I feel crazy.