My filling in came out now I am in pain can I buy over the counter filling will it help

No, but there are products like clove oil that help kill the pain a little. And of course, Tylenol, ibuprofin, and aspirin.

A filling won't stick to your tooth without a very clean dry tooth surface and a special amalgam (filling material). You could scrape together a few dollars for a dentist to give you a temporary filling which might last a long time, but no guarantee.

The over the counter are great temp use till you can get into the dentist for a new filling.