Is this really anxiety/ panic attack out of nowhere sat in a room speaking to a lady on an appointment and I go really dizzy/light headed it actually felt like I was going to pass out my heart started pounding really fast I left the room to get some fresh air as it scared me so much. Went back in after I grabbed a bottle of water from my car and drank it straight off I was shaking so bad. It sore off but then came back felt light headed again got in my car stupid I know but rushed home crying with fear I was about to die. I've been checking my pulse lately and it's been 63,64,65 at rest and as I was panicking it was about 100. Is this an anxiety disorder or panic attack?