Yes, it's a common procedure.
They are looking for impaired blood flow or small strokes in your brain.
Absolutely, they may be able to fix what ails you before it becomes permanent and, if they find nothing, at least they know enough to look elsewhere. Don't worry, it's not that hard to have a CAT scan. They will put your head in a plastic brace to hold it in the right position and they may give you a shot of contrasting solution. The scan itself is done in a few second. They keep your head attached to your body at all times.
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brain ct scan for central nervous system 
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