I am a graduate of Islamic metaphysics and theology with a focus on mysticism and mystical philosophy. I have kin interest in spirituality in general. Recently I started trying out meditation. In the past I have had experiences of energy building up in my chest during contemplating mystical works. And I have had attempts at out of body projection without full success yet. But in either cases massive energy building up in my chest has been a familiar occurrence.
Now recently that I started the Indian style meditation, i.e. sitting in one place, chasing out thoughts and concentrating on heart beats, while gazing at the back of my closed eyelids, I feel massive energy rushing to my chest, building up there and then rushing further up into my neck. At the same time my upper body starts shaking stronger and stronger. More recently, I felt as if my jugular vein was about to explode and I felt mild pain on the back of neck.
I want to know what the heck is this all about? My feeling is that if I continue I may project out of body, as this was the feeling that I had when trying out of body projection back in older days but the pressure becomes almost unbearable. I feel nervous to continue the meditation with these twitchings and sensations.