I get those quite often, though sometimes I might go a couple months without one...but yeah I've always had anxiety issues which causes different sorts of panic attacks. But with the PTSD I have certainly had what you describe I've had times I have to go in my room essentially hide under my blankets till it subsides a little the valium I have for anxiety can help a little but it takes a while to kick in. But yeah I suppose my room is sort of my 'safe' place so that is why I go there...when I am not home I might lock myself in a bathroom with the light off till I feel safe enough to come out.

But yeah with those I get paranoid like something is happening and I have to react and protect myself....with the normal anxiety attacks I've gotten its more of an indirect feeling of panic that sort of builds up and exausts itsself. But yeah I've tried explaining to mental health professionals with those a lot of the grounding techniques that can help general anxiety attacks don't do much for those.