Try to have some good (and calm) moments when everything is over. Even if the person gets randomly full of energy (it happens sometimes in my case), a panic attack is extremely exhausting.

One panic attack can be followed by others at small-medium intervals, that's how it works for me. But only if stressful situations happen again, mainly. So keep calm, and if there anything to do that you can like cooking, do it simple and do it if you can (don't force yourself if you can't either).

I know it seems a lot. But I guess any person that suffers from panic attacks will be very grateful for your help. Sincerely.