The Parallex was very likely unaffected, But you clearly have a problem somewhere.
As the other reply said Turn off ALL Breakers, Then see if it still instant trips.. If it does you have a short in your cord or lug.. I came close to that (Had an open in the plug) 2 weeks ago but fixed it.
Then turn on the main.. Still no trip? good,
Turn on ONE branch, then the next, then the next
If you can make the first branch something you can plug a lamp into Turn lamp on.. Light is good
now one at a time turn on other breakers, when the lamp goes dark.. You found it.