Sorry to hear about your panic attacks and I doubt I can shed any light on them.

It sounds like you are doing better than last time - perhaps its the vitamins and perhaps its a different, more educated perspective.

Since you mention dehydrahation, I recommend that you really hit the water hard. For you, about 80 oz a day is a minimum and I would recommend going for a full gallon (128 oz).

Hang in there and Keep the Faith!