My Dad Had Triple Bypass Surgery On 12/28. No Complications.

My dad had triple bypass surgery on 12/28. No complications. He is 77. He has had a cough for a couple of years and once prior to the surgery had a seizure like episode that lasted a few seconds. Since the surgery he has had increasing cough with short seizures. His limbs shake and he gets light headed. A few times he has been nonresponsive, but quickly regains composure. They plan to call their doctor tomorrow. Is this something they should check immediately?