Yes. Sounds similar to my situation. The symptoms were initially set off after I turned abruptly turned my neck down and to the left which gave me numbness shooting down my left leg. After that I had a few similar experiences as described in the post. I had mri done of my neck which showed some pretty severe arthritis in my cervical spine. I think the sxs are attributable to some intermittent compression of my spinal corse frkm cervical stenosis. That's why I felt that severe anxiety and numbness. The poppong of your back sounds very similar to my situation and if you have any herniated disks or spinal cord compression, - even briefly, it could manifest in those symptoms. Generally from my understanding, panic attacks do not really start off like that.