Weird Issue few days ago. *UPDATE* Fuel Pump!

[Nik]

Hello again guys,
Few days ago it was very hot, so I decided to go to the mountains place with my friends, sit outside and eat there, It's like 30Miles away. Ok so, while we spend some time, It starts raining all of a sudden very, very hard... I go outside, start the car, put some heat and seat heater to get at least a little dry and park outside waiting for them to come out. After a minute of two, I put Gear in Drive and press the pedal, However it doesn't go forward, it doesn't even Rev up, Like it has no feeling whatsoever. I restart a few times, car starts and doesn't Rev up. Constant turning of starter kills my battery, after some asking I get jumpstart but still the same! I thought It was some Fuel problem and there is nothing to do, so I call the help. My friend called the tow (one that you put your car on top) and came to pick us up, 5 of us got in the car and leave the car in the service(it was closed, was 1AM) I was a little emberessed that my X had left us there, there were girls also, However we did have good time so fuck it!
The next morning I go to my car, get jumpstart and it starts up just fine. Got it to GT1 and it says that Both post-cat sensors are messing up. I hadn't changed them just yet, but I do feel a little vibration on the Gas Pedal when I press it smoothly, 1.7-1.9k on the tachometer. Any Ideas? Why in the hell would it get wet? I didn't drive it in the big water, but when I got in, water was there a little higher then my sneaker(so I got all wet).
00 M62. No SES light or anything afterwords.