Peaches.
I can relate to that horrible feeling of waiting for the other shoe to drop. Frankly, it took me awhile before it didn't rule my life.
Occasionally, I'll still have that feeling.

Like you, I'm a planner.
Plan A. If it doesn't work, Plan B. If that doesn't work, Plan C.
It feels safer having a back up, although I'm more at ease about it now.

My therapist helped me understand that I could handle anything that came my way...
Actually here is the quote he gave me,
"I can handle anything life throws at me. I may not be able to handle it well or correctly or gracefully or even with finesse or expediently...But I Will Handle It."
In many ways it took some pressure off in thinking I had to handle it in a perfect way.

peace,
Cap