I experienced sudden lightheadedness with an extreme wave of heat that felt like it was coming from the inside out, and nauseous feeling. Did not faint but felt like I was on the verge of it. Lost all color in my face. Used a very cold compress to get to feeling a little better but unsteady on my feet. Laid down, but immediately had to go deficate and totally emptied out. Slept about 3 hours. Feel extremely tired and weak. I do not have any history of hypertension or hypotension, no diabetes, no heart problems (although I felt like my heart was pounding, not fast, just more pronouced than normal), no hypoglycemia or any health conditions. However, I have experienced a panic attack before with some associated anxiety. No family history of any illnesses with the exception that my mom had atrial fibrillation at 82. Could this be caused from a panic attack?