Speed Control Springs problems of the 1999 Ford F-150

I turned right from a stop sign and merged into traffic. I had a car in front of me and several behind me. I floored the accelerator pedal. When I released the pedal it was stuck to the floor and did not depress. At this time I stepped on the pedal again to see if this would free it but there was not even any spring to it. I then hit my brakes once to see if this would free my accelerator pedal(as you would do if your cruise control was on/ mine was not on) to no avail. Now I was about to rear end the car in front of me and there was a semi-trailer in the left lane my first reaction was to lock up my brakes. I did so and the rear tires continued to spin out of control at full throttle. The truck slid for 168' before going into a ditch on right side of road and over turning. No injury to me, just a mail box and my truck. Mccandless Ford dealership inspected vehicle and found no problems. Ford motor CO. Said they were not responsible do to the mileage being over 36000 miles, and last but not least my insurance agent said they would fix the body but could not have throttle fixed because there was not a problem. Everybody has wiped their hands of the issue and this vehicle will be put back on the road with the same problem of throttle sticking wide open. I have four children who ride in this truck and since I know of problem I can not drive this vehicle in this condition. This vehicle will one day take a human life or lives and my insurance CO will not even pay to have another mechanic look at it. How many of us get a second opinion, even from a highly educated dr. Let alone a mechanic.