I was truly terrified about 7-8 years ago returning to South Carolina from a vacation in the Bahamas. As a fairly new instrument pilot I landed in Fort Pierce to clear customs and checked the weather. T-storms all over except off shore. ATC would not let me fly off shore north along the FL coast due to restricted airspace with Cape Canaveral, but offered a route via radar vectors that SHOULD keep me out of storms. I accepted and began to fly north. I looked out the window as I flew just east of MCO at 6-7k feet. Although I never flew into the clouds on this leg of the flight, I experienced winds like I have never experienced. My airspeed varied between 140kts to 80kts and back to 140kts indicated in one second, and the airplane was on the verge of being out of control. For a few minutes, I was absolutly unable to maintain altitude and told ATC so. I was only concerned with keeping the attitude reasonable and the airspeed just below manuvering speed. It was scary and I had my wife and 2 kids in the plane. I remember my young son getting mad at me and shouting "Dad, you are a terrible pilot" Little did they know how close I was to panic. I am much more conservative around severe weather now!!