All of a sudden, my car is pulling hard to the left. It acts, feels, and sound like a flat driver's side front tire, but the tire is fine. The other day I was driving in a bad rain and hit a pothole that was flooded (and thus invisible). i don't know that the two are related, just a thought.

If I let go of the wheel, it pulls hard to the left. I can also feel slight vibration in the steering wheel and even in the gas pedal. At low speeds (<35mph) it pulls slightly, but otherwise nothing (no noise, vibration etc.). At higher speeds it pulls harder and the vibration and noise increase. Like I say, it acts just like a flat.

Any ideas what this could be? Is it somehting that I can fix myself?
Thanks,
Bryan