I had an appointment with my doctor this morning. All of the tests so far have come back normal. By mid-afternoon on Wednesday, I'll have the results back from my MRI/MRA. It looks like this may be a one-off thing, or something that we may just not know why it happened, and might happen again at any time. Or, it may happen again, later, then we have another round of tests, and finally find something.
In any case, the last round of tests is yet to come, so I am holding off on any conjections. All I do know is that I have frequent headaches, and fatigue. I'm just more tired than normal for me.