Think it means anything?

So here's the constellation of--I won't call them symptoms, exactly--things that have happened today.

1. Got very dizzy off and on today for a space of about 40 minutes.
2. Sight in my left eye became fuzzy for about an hour or so, a few hours after #1, above.
3. Vague headache now.
4. I either just saw a ghost or something ethereally white sped through my vision.

What's that all sound like? Tumor? Steadily increasing intracranial pressure? An incipient burst aneurysm? Bot-fly larva? Poltergeists? WHAT!?