Goobers has bad headaches. She has for years. We had her eyes tested a long long time ago. We had some blood work done to make sure it wasn't the big C. She kind of learned to live with the pain. As bad as that sounds it is what happened and years went by. Recently the head aches grew worse. We started picking apart her diet and she would experiment with removing things and then adding them back in with no relief. We then tested for allergies and were shocked that wasn't the case. That lead us to the eye doctor. Were were almost relieved to learn that the doctor found an issue that might find relief with glasses.
(Health update: It took about two and a half weeks but her head aches have gotten a little better. They are not gone completely but she can function again.)