Embarrassing situation, but. During sexual intercourse with my partner, sort of. Laying on my back, with my head downward a bit. I felt a pressure build up in my head (rear right side), and then it sort of just felt like it popped or burst. Then i had quite bad pain up my neck and found it difficult to move properly or speak for a few minutes, i was sort of dazed. Sbout 15minutes afterward i started to feel nauseous. I still have the pain in my neck, its sort of more like a heated pressure now though. Is this just a headache caused by how i had my neck?