Does this sound like a panic attack?

So, I suffer from an anxiety disorder, however I thought I had it under control but lately when I go to sleep my ‘brain snaps’ – it’s the only way to describe it; it’s like a gun goes of in my head and produces this weird electrical charge through my body, which in turn wakes me up.
Has anyone else experienced that, and now today I’m exhausted, it only happens really as I’m drifting off to sleep, I can feel myself dropping and then BAM ‘brain snap!’
It’s really annoying – does anyone get this as well?