obsessive thoughts

I have been thinking about this after talking with someone who experiences this on a large scale. I wonder how common it is???? i know i have bouts with thoughts that seem obsessive at various times and especially when I have something im scared to face or deal with various obsessive ideas dwell inside my mind on and off and its like i wish i had a switch where i could just turn them off!!!! I tend to have hypochondriac tendencies as it is so this only adds to that. if i get a headache, it must be a brain tumor or aneurysm..... chest pain heart attack.... as well as a myriad of other possible illnesses. One of the problems of having a wild imagination is imagining any number of bizarre sicknesses or diseases happening to you although it can be comical attimes as well.

Jesus tells us to give all our cares to Him and the Father Apostle paul says to be anxious for nothing God has everything under control. Why does this not work out practiacally on a daily basis???? I believe and know God is in full control and that nothing can separate me from His love which is in Christ Jesus..... but at an emotional/relational level i still so often find ways to worry fret and be anxious as well as obsess ,,,,,, even worse i then start worrying about worrying ai yi yi craziness LOL

Any similar experiences for all of you out there????? Insight and understanding always encouraged!!!!