Why did all my lights flicker and then the van just died?

What is your question?

Have had no problems then all of a sudden today drove over a couple sets of speed bumps. After the second set of speed bumps all my lights flickered and then the van died. I was able to restart, finished driving to the parking spot but, was having the flickering problem as I was parking. As I run the van everything gets brighter when I press on the gas and dim when not, what could be the cause of this issue?