My boyfriend has a mild case of E.D. The other day we were engaging in sexual intercourse, but because of his E.D., we had to take a break. When we resumed, i started by giving him oral sex. However, he soon began complaining that his have was tingling, that he was losing the ability to form words, and that the muscles in his face were constricting. I immediately stopped, and after lying down for a few minutes and drinking some water, he was fine. What could have happened?