So yeah, an internally-abscessed tooth has been to blame for these problems I've had lately. I kinda almost waited too late to get this tooth removed. It had a prior filling from 7 years ago which had gotten bacteria underneath it through a cavity. It was pretty well inflamed, and took way more anesthetic to remove than it should've. But at least it doesn't feel like I have a knife stabbed in my head every 30 minutes anymore. And my facial muscles are all beginning to relax now that there isn't anything causing them to tense up anymore.