A hour ago, while eating salad .i swallowed a jagged mercy filling i have had in my mouth for years. i am concerned this will tear my stomach or wors?

Don't be concerned: Restorations are not that large and the broken piece should pass without an issue. Have that broken tooth restored by a dentist to avoid further problems.

No: Swallowing the filling won't hurt or poison you. It will pass. Be sure to have the tooth fixed before you need a root canal or extraction.

Rare: Would be a rare occurrence. Make sure tooth is fixed.