Joelle,
Optic neuritis was my first symptom and it was after one incident of ON that I was diagnosed. I didn't have any pain. I knew something was wrong because it never happened before. It started as a nagging feeling that my pupil wasn't dilating correctly and so I went to my opthalmologist immediately.
YOU HAVE PAIN IN YOUR HEAD! The # 1 warning sign for stroke is a headache that doesn't go away. Regardless of what you think it MIGHT be, you need to go to the doctor today and rule out what else it COULD be. You are not a doctor and you need to see one now.
A slow bleed in your brain can cause pain. It doesn't have to be a sudden catastrophic blowout.
Please, please don't wait to get this checked out. I have a friend who did that and she had an aneurysm that was a slow leak until it blew and she ended up blind and with massive brain damage. She didn't die but she will never be the person she was before. What happened to her could have been prevented if she had gone to the doctor instead of waiting.
I hope it's just MS messing with you, but get checked out please. Don't put yourself at risk. I don't want to be an alarmist but it's not always MS as we so often remind each other!
Let us know how it goes!