I'll add you to my prayer list Brother.
Just a thought, if it's an automatic transmission, and if it's only 16 years old (fairly modern), it may have something called a "Throttle Position Sensor" (TPS) which tells the transmission when to shift gears. If your transmission is punching into gear hard it could be a bad (TPS) which is cheap, or it could be bad accumulator parts inside the tranny, which would require a tranny rebuild.
If your transmission is slipping when in gear, then you'll need a rebuild due to chewed up gear teeth, or just junk the car.
You could check the tranny fluid to see how bad it is. It's just a dipstick just like oil, all you do is pull the dipstick out, look at the color and put it back in.
Bright red = good
dark red = not good
brown = Uh oh
I drive a 22 year old Chevy K1500 truck that I try to keep running by myself, so I know your feelings
Just some thoughts to help your peace of mind
. God Bless Brother!