About a week ago my husband passed out and hit his head, he had a big knot over his left eye the size of a golf ball. Since then he has dissy spells. Yesterday he passed out and fell to the floor, for. About 10 minutes. I thought he was just stretching his back as he has 5 herniated discs. When he came to he was trying to figure out how he got on the floor. We know he has afib also. I am trying to get him to see his doctor. Could this be serious.