Comfort Zone

Why is it that we get all excited about something new coming into our lives, but then when it actually happens, we feel awful at the start.  There are feelings of regret, sadness, hopelessness, even frustration.  And yet, it generally is something we were really looking forward to happening.  That's where I am right now.  I was so ready and excited for change and now that it's actually happened, I'm feeling apprehensive.  I'm not sure why this is.  I think it is a stretching of our comfort zone.  We are put into a new arena of finding a comfort zone where there is no "zone" to begin with.  We struggle to find our place within the new, and even with our old things around us (I'm speaking particularly about my office space now) we aren't feeling comfort.  So why does God give us these opportunities? Where and how is He calling us to grow with Him in the newness?  These new situations make us trust God on a completely new level.  We step deeper into relationship with Him because He becomes our only comfort zone.  He is the one thing that never changes, which is so comforting.  It's interesting then that we so long for change in our lives, when what we go back to is exactly what, or who, we know.  I'm learning to let God be my comfort zone, so that I am content in any and all situations.