Life is tough sometimes

I have had a rough couple of days, years actually.    I feel so helpless and frustrated.    My world is out of my control.  It is completely and utterly controlled by my Heavenly Father.    Now I think it great to have Heavenly Father in control, I mean who better to have controlling your world.  It is just that sometimes I have to ask how much longer can I take this?  When will Heavenly Father say "okay that is enough, time to send in the sunshine".    I feel like I am being stretched to my limits waiting until I am about to break and I have to ask why, what is the point of this?  What is it I am supposed to learn from all of this and haven't I learned it already?