Hi lunalu, some general thoughts and some things that have helped me deal with anxiety.

It's unlikely that the attacks/vomiting are causing a new concussion, although the increased pressure is likely exacerbating existing symptoms.

Lowing anxiety in general can help reduce or eliminate the panic attacks. While you mention that you feel as though your general anxiety is low, the fact that you hare having panic attacks seems inconsistent with this assessment.

First make sure you are covering the basics of self care, including full nights sleep, good nutrition; check out the vitamins and supplements thread above in the sticky threads of the forum.

Some things I have found helpful in mitigating anxiety include mindfulness meditation, gentle yoga, and massage therapy.

There is a book out that I found helpful called Hijacked by your Brain by Julian Ford, Ph.D. & Jon Wortman. They suggest an approach they refer to as SOS: Step back, reenter the present moment, pay attention to your body and mind. Orient yourself by focusing on what's important in life, and do a Self check on what you are experiencing right now rating your stress and control levels. I'm not a psychologist but this makes sense to me and seems to work.

Best to you.