I have posted on both the anxiety and BiPolar sites, having both. I am not sure where this might fit in but yesterday I was sitting in a big soft chair and had my knees bent and turned to the right (almost sitting on my feet with my knees pointing to the right). I went to get up and when I unbent my legs I heard a pop on the left groin area and an incredible sensation of sharp pain. What was really weird about it was immediately I felt a warm rush sensation from that area to my head that heightened in intensity like waves almost until I blacked out. Briefly but blacked out. From that point on I was wiped out of energy for the rest of the day. My head was buzzing and I had tingling and fatigue. This reminded me of my first panic attack I had where I kept blacking out, it felt the same way but I was not having a panic attack. What I am wondering........what was that????!! Anyone have any similar experience?