I said brain because if i said "head" everyone would be assuming i am talking about penis head. Well actually i am talking about THE HEAD that is over my shoulders

. Anyways recently i started having this "problem". I am man 25 years old and when i ejaculate i feel very strong pain in my brain. It start around middle of my skull and gets stronger in back of my head, i am very worried because last time pain was so strong! I was lost for a few seconds. Strongest pain lasts around 30 seconds, and gets weaker in next 5 or so minutes when everything begins to come back to "normal".
Very strange, i searched internet but was unable to find answers, so i decided to ask here. Can someone help me, any clues?