Avoid caffeine.

Take a look on WWW.PUBMED.GOV.
Look for the research on the use of high dose myo-inositol in
subjects having panic attacks, eating disorders, and OCD.
They were using 18 grams of inositol per day.
If you decide to use it, use the powder not the tablet
as the tablets contain too little and are too costly.
The powder is sweet and very sugar like. In fact,
an early name for it was "meat sugar."
It works by decreaseing serotonin tolerance or should
I say increasing serotonin sensitivity. It works at
the post-synapic gap secondary messanger level.

I use it. I take it as a truly heaping tablespoonful in
milk, juice, or water.

Disclaimer:
Will this work for you, I have no idea.  I am not a Doc.
This not medical grade advice. Talk to your
Doctor so he can sneer at you and perhaps offer SSRI meds
instead. Further my comments are based on memory
and I never trust my memory. YMMV

BH: Although nutrition is important, I would look first to behavior.
Most likely, you are worrying about something which is getting your
adrenaline going. That causes you to hyperventilate which drives down
your blood CO2 which causes your blood to become too alkaline which
gives your mind something REAL to worry about, at which point a
vicious circle takes hold and you spiral into a full blown
panic/anxiety attack. Of course, you could have adrenal cancer or
other metabolic disturbances which are causing the production of
adrenaline, but that is less likely.

So, stopping the worrying would be the first choice. Not allowing your
mind to think of bad things is a great start. You CAN control your
thoughts. Try to think of something nice, like how much you enjoy
petting your cat.

Next would be to limit the hyperventilating. You can do that by
breathing through your nose, NOT your mouth. Next would be "square
breathing": breath in for 4 seconds, hold for 4 seconds, out for 4
seconds, hold for 4 seconds.The next thing would be to rebreath into a
bag, plastic or paper, take your pick, which will raise the level of
CO2 in your blood, averting the anxiety attack.
                     Hope this helps,  BlackHawk

If they're from excess stress hormone/cortisol, phosphatidylserine,
200-400 mg.

Susan

Nope!  Vitamins are not effective against this type of problem

Stay away from using the herb kava kava  as its use can be quite
toxic, if not fatal.

http://www.google.com/search?hl=en&newwindow=1&safe=off&rlz=1B2GGGL_enUS204US205
&q=alternative+%22Panic+attacks%22+OR+%22Anxiety+attacks%22+cure+OR+treatment+OR
+therapy&btnG=Search

I would recommend deep breathing during an attack.
http://naturalhealthperspective.com/resilience/deep-breathing.html

And, you are probably eating a horrible diet.
http://naturalhealthperspective.com/food/diettips.html

Magnesium, but look for citrate rather than oxide.

MattLB

It would have been nice to know the little detail about wanting it to
treat Obsessive-Compulsive Disorder (OCD), as well as being a
psychiatric patient, up front.

The assumption is that you are only guessing that you are suffering
from Panic & Anxiety attacks.

Cut out sugar and other refined carbs like white wheat products. Eat
real food. Supplement with two b vitamin complex stress formula per
day, at breakfast with food would be good. Take 1000 to 3000 mgs of
vitamin C, three to four times a day with food.

You will see a difference within days. It worked for me.

There's a slight discrepancy between your query and the Subject line.

Ordinarily, "natural" would suggest something other than vitamins and
supplements, such as camomile tea or relaxation exercises.