I have been having mild anxiety most days recently, yesterday I was standing feeding the birds out the front of the house as I normally do, and anxiety hit out of no where, it wasn't bad, but I felt the physical symptoms I usually do, fast heart beat, breathing, a nervous energy, I was staring at a tree and suddenly my focus was totally only the tree, everything else was a blur, it was like nothing else existed right then outside of that tree, i've had similar incidences, but never to this degree, it only lasted maybe 20 seconds but it was so unusual I had to share, see if it's something anyone else has experienced.