My basement is a swimming pool

[Flo-Flo Chique]

The cars and stairs thing could be explained as an unbalance in your auditive system, since that affects balance and reflexes, go see an Otolaryngologyst if you notice something funny with your ears or sense of balance. And about the flood, when was the last time you had the plumbs checked?

What on Earth is an Otolaryngolgyst? Also, I never get my plumbing checked :P