When Everything Falls Apart

Life hasn't always worked out the way I had it all planned. Plan B,C,D,E,F,.....Z are often employed. I know that God's ways and plans are better than mine. I know more often than I care to admit, that I interrupt His best plans for me, with my rebellion, disobedience and independent ways.
Right now, I am struggling with trusting Him totally. I can give a lot of lip service to trust in Him always in all things. But when it comes down to it. I don't think I do a good job with trust always in all. There is that nagging fear or worry that the shoe is going to drop, the inevitable is about to happen, the worst case scenario is about to become reality that haunts me. If I am being haunted or thinking on these things do I really trust? Can I trust or rather will I trust God when everything falls apart in my world? Will it be the end of the world if things become tough, not as I planned? If my happiness, peace, security in this world relies on my plans for life, I may be in for a large dose of grief. How do I focus on God's love and provision for me? He has never failed me in the past, even when my plans so miserably failed. I know what I should do, but I need the discipline and the desire to really do it before everything does fall apart.