Q: I Used an app called Appcleaner and deleted all my widgets please help!

Unfortunately, third party so called cleaning utillties can cause more harm than good and not necessary on a Mac.

You can re download widgets from here >  Apple - Downloads - Dashboard

Or restore from a backup.

FYI... your Mac runs maintenance for you in the background >  Mac OS X: About background maintenance tasks

App cleaner is not clean up software.

It's a way to delete apps without leaving pieces behind.

It works like the trash-it will only delete things you place in it.