You are fine, don't worry! However, this is exactly why you ALWAYS BACKUP FIRST!!!!
You need to find the stock backup (it's in the all-things-root forum, be sure you go to the right one, Sprint Vs VirginMobile). Power your phone off and take the sdcard out. Using your computer's card reader, or another device you can put the sdcard in and hook up to your computer, place the downloaded stock backup on the sdcard.
Once you have the stock backup on your sdcard, put the sdcard back in your phone and boot into recovery (hold volume-up + power). Once in recovery, wipe cache and dalvik-cache (just for safety),restore the stock backup, then reboot.
Note- Be sure you use the proper backup for the recovery you have installed, some backups made in CWM do not flash in TWRP and visa-versa!