I get headache when I attend any meeting or if I am in a group of people are talking about the matters which I have interest in.?
Emotions and Pain. My area of interest is in the way our emotions, our feelings will manifest themselves as physical pain. A common way this happens is tms - tension myositis syndrome. Pain is real in patients with tms, but the cascade of pain begins from an emotion - not an injury. A nice place to start to learn about this is the tms wiki. I also talk about it on my own website (www.Thehealthymind.Com).
Triggers. Headache can be caused by triggers and triggers can be anything. It seems like that being in a group might be your trigger. Stress, social anxiety are common triggers; pay attention to your stress level, stay well hydrated, and avoid headache toxins (caffeine, nsaids, acetaminophen, opiates).