Weakness, confused speech, etc, as you describe, may be related to a vascular event such as a stroke
. CT heads are good in the acute
phase particularly if you are concerned about bleeding. However, they are not sensitive in identifying strokes in the acute phase. I would recommend that your friend have an MRI of her/his brain to evaluate further. Additionally, does your friend have any medical history, neurological history of seizures, etc, history of low back pain?