o2 sensor broke, hole in headers!!!!!!

hey,
i was tryin to break lose my stock o2 sesnor from stock headers, and i ended up stripping the nut that holds the sensor in, and also breakin off the sensor. so now i have no 02 sensor and a hole in my headers the size of a quarter!!. i know it is kinda bad to run my car without a 02 sensor, but how bad is it???
ALSO if anyone has any headers, they wanna sell, preferably dc sports, i need to get some any way so i might buy em from u. i live in sacramento, and am more than willing to drive to bay area, but prefer somewhere in cali. thanks u guys. i already have a new 02 sesnor.
the reason i was tryin to change my sensor wasss becuse of a low idle on my car and also after tryin to change it bfore i banged it up and my car was idling, high, then low, then high again.