Other Fuel System Tank Assembly problems of the 2005 BMW X5

I was at a stop sign then accelerated onto a round-a-bout when the vehicle stopped it would not accelerate even though my foot was on the gas pedal and the car was still on. I tried signaling my emergency lights but the whole inside of the dashboard was going on & off not letting me signal anything. I put the vehicle in park & turned off the car. When I tried turning it back on it would just click and all lights would turn on. I waited for 20 min then tried to start it again & it did start but then sounded like it was dying out and eventually would shut off, there was more than a half tank of gas in the vehicle.