Sameer, I have absolutely had brutal headaches while becoming sexually excited along with other cognitive and flu-like symptoms prior to ejaculation and orgasm. The fog comes on quick and hard and feels as though it begins to attack my body before i have even had an orgasm, yet gets horribly worse when I do. I understand your pain. I'm currently trying a desensitization treatment and searching for answers with niacin. I hope one of the the two will pay off. I started my treatment about 6 months ago and do not take niacin regularly yet, but have some confidence in its ability to alleviate some symptoms based on the reading I have been doing on it.