Wow, i have now experienced almost the same excact things youre describing. This is the closest outside explaination of the symptoms i have come across.
It is terrifying when it happens. It also comes when smoking for me. I would be higly grateful if you could share what it is, or how you treated it (if you have treated it), kinda how it went, as seeing this was some time ago. Im in the same situation as you, and im trying to find out what these weird and scary sensations are.
Thank you.