Engine Noise problems of the 2005 Ford Freestar

I was driving on an inclined off ramp towards my destination. My car once it got to the top of the incline began to slow down and the rpms were excelerating and all of a sudden my car came to a stop I was then spooked so I turned my car off and then turned it back on and it was making a loud revving sound and wouldnt go into any gears. . So now my car is just stuck and I topped off all of my fluids. . I really dont know what to do. . Im a mother of two and also a fulltime employee. . And I really cant be with out a vehicle!! help!!.

This is about a 2005 Ford Freestar. When accelerating, specially in rainy conditions, the vehicle's engine makes a screechy noise and loses power. The screechy noise sometimes stops and the vehicle is able to continue moving. Usually when it's wet/rainy the engine loses power and vibrates. It's very dangerous and stressful because it usually happens when attempting to pass slower vehicles on the left lanes and when the vehicle loses power we attempt to move to the right lane's shoulder. Lucky that this happened when traffic was light at 6am. After restarting the engine I drove on side roads to reach my destination. This has happened at least twenty times since 2013.

While driving down the road, the van will suddenly die. All alarms, engine light, abs, traction control. Will go off. Sudenly there is no power. Van will start right back up and drive again. This has been going on for over a year. I have had it at 7 different mechanics, including the Ford dealership where I purchased the vehicle. It has happened at all different speeds, 20-65, also happens if stalled at a stop light or drive-thru. Additionally, I can be driving at 25-35mph and the rpm's will shoot up to 7000 or fall all the way down like you are idleing. Vehicle makes noises like it is going to blow up and then will be fine.