Had a filling hit a nerve and I was doubling over years back. Went back to the dentist straight away when I got home coz all the pain medication wasn't doing enough. Almost had a root canal.

Get it removed ASAP. I removed mine when i had braces in high school. My head almost jerked as much as the tooth and the dentist was using plier-like things to be able to get it out.

It was a real struggle