My Husband, 71 Years Old, Had An Episode On Saturday

My husband, 71 years old, had an episode on Saturday with what he has called stomach blood rush. He feels like he's going to have bowel movement and usually does, but he feels very sick, breaks out into a cold sweat all over his body and this time, he was trying to lay down as that usually helps calm it but he either fainted or had a ceasure of some kind. I could not get him to follow my movement with his eyes and he could not speak words that you could understand. this lasted for like a minute and he then started talking normally and his stomach was upset most of the night. What is stomach blood rush?