I had "extreme anxiety" a couple years ago. I had the urge to bolt come upon me. And it is funny, that for many years I was in more stressful situations without ever encountering it.
I was diving a wreck with an op for the first time. My mix was way to rich for the bottom, but I thought I had adequately done my research on the wreck. No hard bottom it turned was within my MOD, but for a small fantail section up in the ripping current. (issue number 1)
If I were the op, I would never have dropped us that day. The guy setting the hook had a lot of trouble. The marker balls were being pulled under and as the divers entered the water and pulled themselves along the granny line, masks (and snorkels) were being pulled off. My buddy and I (as with the other divers had to struggle against the current to get to the down line. By the time we made it to the down line I was exhausted and over breathing my reg.( Issue #2).
When my buddy and I hit the fantail where the line was tied off, my computer crapped out. (issue # 3). I was too winded to stay up at the "hard bottom" of the fantail, but also realized that the bottom of the hold would be beyond my MOD. To make it worse, my buddy had been sick and was having trouble clearing. He hung onto a rail on the deck looking like the hurricane flags the weather channel puts up during the hurricane updates.
I had my Aqualand watch with the depth gauge in it (fortunately) and was able to drop down in the hold out of the current and still stay above my MOD. Hanging there with all this crap going wrong, the demons came. LOL.
I focused on my breathing. Focused on my little watch face and my buddy above me flapping in the breeze alternately. I did something else. I remembered reading in Rodales 10 or 11 years ago, that in case like this, it helps to hug your buddy. It was not going to happen. But the mag said it helps to hug yourself. So I crossed my arms across my chest concentrated on breathing etc. and recited the The Bene Gesserit Littainy against Fear:
I must not fear.
Fear is the mind-killer.
Fear is the little-death that brings total obliteration.
I will face my fear.
I will permit it to pass over me and through me.
And when it has gone past I will turn the inner eye to see its path.
Where the fear has gone there will be nothing.
Only I will remain.