Searching for cause to engine shake and electrical failure.

Here's the story. I drive off the highway and thought that a car next to me had really loud base music, since my car was shaking. I realize that it's actually my car, and that the engine is almost "jumping". Like it's trying to rev forward and would probably hit the car in front of me if I hadn't been braking. I noticed at this point that an extra light was on, it was the ECT POWER switch that is below and to the left of the gear shift. I had never turned that on before, so I turned it off thinking that was the cause of the shaking. I drive a little more and notice that the acceleration isn't really working, it's very weak and I could have pressed down the pedal completely and it wouldn't have moved. I manage to get it to a parking lot and turn it off, wait for a while, then turn it back on. It seemed fine so I test drove it a little ways. After about a minute, the engine started making that shaking feeling again (the ECT PWR switch is still off at this point) and then suddenly my dashboard lights flash and the power steering stops working and the brakes became really hard to press. (I'm thinking the electronics stopped working? However, the lights were still on in the dashboard, so the battery isn't dead.) At this point, I park it and get it towed home, since I'm not driving without brakes. :) In any case, I was wondering if this is something easy, like I'm low on some sort of fluid, or if it's something I need to take it to the shop to get diagnosed. Any help would be appreciated!