Symptoms of mini stroke?

My husband has end-stage congestive heart failure and copd, and has been diagnosed with hypoxia (not sure if this is permanent). Last week he had what he believes was a mini stroke, while waking up in the morning he felt pain in a part of the brain and then was "groggy" for ca. 2 hours afterwards, but still able to drive and function (nobody in the family noticed anything). How likely is this to have been a ministroke (TIA)? If it was, how dangerous is it? Long-term effects? Likelihood of a real stroke in the future? He is 61 and Hispanic. Thankful for any insights.