Car is dieing, help

crapola
First off i'd like to say that all of this started last week and has just been a downward spiral...

Alright. Where to begin... My transmission is slipping and sometimes doesn't even find second gear, the rear suspension is broken (im not sure what it is, i think its a strut, the backend 'bounces' and i have a waggle)

when the transmission shifts into overdrive i get whiplash. the gears whine (a little bit more than before, still probably normal)

going around corners the car feels like its skipping (im guessing suspension and or transmission?)

Feels like possible steering problems im not sure...
the car doesn't brake as well anymore (rear suspension maybe? transmission not downshifting?)

The only cause i can think of is last wednesday there was a rain storm, and it was 10 degrees celcius (so like... 30 farenheit? im not sure) anyways, i had to drive my car to make it to university, was doing 120km/h (highway), then slowed to about 70km/h once i got by the school, i hit a large(deep!) puddle which I didn't see (apparently the sewer drain was plugged/flooded), jerked the car and slowed it right down, the wheels steamed (normal i figured, brakes = hot)... anyways, i was half a block from the school, parked, went to class... an hour later got into the car put it in reverse, did kind of a double jerk (felt like one wheel got power before the other almost), then i stopped, put it in drive waited a second till i figured it was in gear, gave it gas, nothing, rpms were about 2000, then it dropped it into gear... then going home i was taking it easy, got on the ring road, some semi was in front of me doing 90, and i couldn't see (no mudflaps on semi, lots of rain), went to pass, accelerated using the cruise control, stopped acceleraing... doing a consistent speed of 110 beside the semi, and then the car decided to downshift and go sideways when i was beside the semi, so i slowed to 80 and did that the rest of the way home. The brakes aren't warped, and the rotors are good, theres none of that going on, tires are fine, checked the rearend (lied down got someone to push on car) and couldn't see anything broken...

Im taking it to the dealership tommorrow for their 40 point inspection or whatever, i have no money (student) and the cars not paid off, i was going to garage the car next week so i dont really need it back for 4 months, but i dont know what to do...