Be prepared with questions. You may need to consult a neurologist. Also, be assertive in getting the information you need. Keep a monthly medicine chart recording date and time for various medications. There is a whole new life out there after assuming the role as caregiver.
Family is utmost.
It can be done for both you and your loved one. Give this person a chance to reach out in whatever small ways they can. You can have a quality life that is more satisfying and rewarding to both of you. Do not give up. It is very easy to slip into a depressed state.