Geez I'd missed this thread while traveling....sorry to hear it. My initial reaction was that it sounded eerily reminiscent of what happened to our 30-year-old next door neighbor on X-Mas eve three years ago. She'd been down at the gym working out (doing some gymnastic moves) and developed a headache later in the evening..then the dizzyness and all the rest of it. There was blockage of the artery in the brain but it was too difficult to get at and they left it there but thankfully it dissolved itself. But based on your most recent posts seems as though they've ruled that out...so hopefully they zero in on it when you have the Mon. tests.
My wife's advice is to be the best case manager you can be, have multiple copies of everything, and bring them along every time you visit a new doctor (or even your own at first -- don't need to tell them you don't trust their record-keeping until they don't have everything). Pester people, (politely, but firmly) and never hesitate to get a second or third opinion.
Communication from the folks who do the scans and read them back to other doctors is not necessarily timely (or on your schedule) so never presume that this kind of information has been transferred.
Bottom line, ask, ask, ask. Some of the doctors best work is when they consult with each other -- adding knowledge and brainstorming -- so if nothing else, ask the various specialists if they would mind having a conference call (set up by your primary Dr. )
Don't worry, they'll figure it all out and you'll be good to go.