Transmission Stuck In Gear problems of the 2013 Ford Expedition

Today as I was driving on perry rd about to turn onto fm 1960 rd e. When I started to accelerate to turn, my transmission down shifted while I'm driving at about 15 miles an hour instead of going up and jerked my car pretty good. I let go of the gas pedal for a second, then tried again slowly. The car started to jerk as if it was struggling to accelerate forward. It did after about 10 seconds. Then the speedometer dropped down to 0 and my digital fuel information that's displayed on my dash dotted out and a screwdriver icon flashed for a few times. The car then started to move smoothly, but seemed stuck in gear. This followed with the tmps sensor kicking on. No check engine lights showed up during this period and when I got to where I was safe, I turned the car off for about 15 minutes. When I turned it on again, it was perfectly normal. This has happened before while I drove on a major highway and it is scary. No diagnostic test has found an issue and I cannot afford to pay for an exploratory service as I just did a coolant repair a couple of weeks ago.