Hello Gr8dame, may I ask a question? Was your DH able to describe to you what he meant by feeling strange? I ask because besides the possibility that he did have a TIA there is the possibility that he had a focal awareness seizure (aura) followed by a small focal impaired awareness seizure, which is where a person doesn't lose complete consciousness ( or convulse) and don't necessarily fall to the floor but may not be aware that they had consciousness. After a seizure of this type a person will be in a confused/disoriented state and for a short while either not know where they are, what they were doing or how to do it. or all three. It doesn't mean he has epilepsy, one in 3/4 people are likely to have one seizure in their lifetime and never have another one.
As others have said, make a note of what happened, be vigilant and if it happens again it's important that he seeks advice.