Be persistent. Those suffering from moderate to severe brain injuries often need rehabilitation to relearn basic tasks like bathing, getting dressed, and communicating. It can be extremely stressful to relearn familiar tasks with a brain injury. What was once familiar now seems strange and impossible.
There is some research that suggests the sooner you start rehab, the more progress you might make. Lean on your family as a necessary support system and attend all rehabilitation. You will probably attend rehabilitation on an inpatient basis at first, for typically 30 to 90 days. After discharge, you might continue on with rehab.