With In 35 Minutes My Husband Went From Having His

With in 35 minutes my husband went from having his morning coffee to: dry heaves, severe dizziness, and sweating so bad he was pouring water out of his body". I took him to the ER and his body temp dropped down to 89 degrees. After 9 hours in the ER he was diagnosed with vertigo. Healthy up to this point in life. How does someone get vertigo with a 30 min window of a sever body temp drop. I don't believe it's vertigo. He did get a CT scan and it was clear. Could it be anything else