how to repair el captain disk on mac when stuck on OS X utilities page. i erased all my info and the disk off on my computer by accident and i have no clue how to get it back. i have a 2007 i mac with el captain

If you erased the disk and didn't have a backup, which it doesn't sound like you do, you've likely lost anything that was on that disk. There are data recovery options like Data Rescue 5 https://www.prosofteng.com/data-recovery-software/ that might be able to get your data back, but the more you mess with that drive the less the chances are. Alternatively there are professional data recovery services which might be able to get your data back, but they are extremely expensive. Is your data worth possibly thousands of dollars?

If data recovery becomes not an option you can just select "reinstall os x" from the utilities menu and start fresh. In the future you should get an external hard drive and use Time Machine to backup your data to prevent future data loss How to use Time Machine to back up or restore your Mac - Apple Support