What could be cause these symptoms?

Anyway, I guess for the past two weeks I've had symptoms pretty much come out of nowhere. Anyway it all started in the order of a week and a half ago. I was reading a book and then adjectives of a sudden I couldn't make out half the words cause they be pretty distorted but then it went away left next to a tension headache. Anyway every since then I seem to be have frequent headaches, nothing to intense just notion a lot of pressure in the front of my head. I also nearly passed out the other year and think I actually passed out for couple of seconds yesterday effect I couldn't remember exactly what happened and my BF said he had seen me plunge over but did not see the whole thing. He also said I was confused for a few minutes and couldn;t follow his finger but later I was fine, so I didn't wanna go to the ER.I was a moment ago really tired and didn't want to go to sleep for a few hours just in casing I hit my head or something. So what do you think it could be? Maybe I'm diabetic? I know it can cause optical defects and would explain the passing out and all that. Going to the DR tomorrow simply wondering to expect before I go in and what I should discuss as possibilities or what to be tested for.
Answers:    He might build you get a cat-scan. He will probably do blood work as well. You did good by making a Dr.'s appointment. Just be sure and let somebody know him everything that is going on. Things will work out. Good-luck.
I'm not sure what it could be. Maybe as simple as dehydration? Drink a lot of water until that time going to the doctor!
He will just ask you a lot of questions resembling... When did you get it? Explain it... blah blah blah! Couldn't see him taking blood or urine or anything though to be honest. He'll take your blood pressure and pulse probably!

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