i was pushed out of the back of a truck going around 45 mph.
What sort of world do you live in?
This doesn't happen in civilization.
....and the gate was down at the back of the truckbed? ...the one you were riding in? ...assuming this was a pickup truck and not a dump truck.
There are at least four acts of lunacy involved here, committed by at least three different people.
I admire your moxie in getting airborne so soon.
I'd bet you could find parts at Radio Shack to build a little finger switched USB potentiometer that you could bandage to your hand, all for less than $15. Plus you could just leave it bandaged to your hand when out in public.
Luck.