My Husband Is Experiences Strange Symptoms And They Have Been

My husband is experiences strange symptoms and they have been occurring for about 2.5 years now. He gets dizzy frequently (regardless of his position). He has severe neck pain and it's very stiff. He has facial tingling. Many times he has a sensation of being out of balance when he walks. He has fequent feelings of fullness on the left and right sides of his upper neck to his lower head, the side changes, sometimes it is in the center of his upper head.
He has been checked for blood pressure and it's not correlated. We do not need a referral to see a specialist for our insurance to cover cost. What type of specialist may be able to help??