Hi, My Father Has Been Complaining About Occasional Dizziness, And

Hi, my father has been complaining about occasional dizziness, and time to time neck pain upto about a week ago. A week ago he started to become dizzy most of the time, very tired, and has on and off pain in his neck. This past week he has slept alot. We went to the ER yesterday and they said his heart looked ok. His blood pressure was very high when he was admitted. It was 180/111... At the time of discharge it was 164/111.... He has had some blood tests and they are pending. They said his blood work yesterday was fine, but the tests they did focused on his heart. What could this be? He did get bit by a tick about 4 months ago, but went to his doctor and got antibiotics. Very confused, would love to hear your thoughts on this.