Since this is something I am personally very familiar with, I can speak with a great deal of authority. There are two kinds of Panic Disorder. One is a very real chemical imbalance that causes the panic response to occur either triggered or randomly. and often for no particular or logical reason. The second is stress induced panic, or cognitive breakdown..
The second is very common and has some pretty good strategies for management. The former needs a GOOD psychiatrist to diagnose and treat. I emphasize good because many doctors think they know it all, but are completely flummoxed when a patient is afflicted with random attacks that can easily take over a person's life and even ruin it.
How to treat panic (not doctor's advice, but what I can recall of it):
Sleep. Good restful, quality sleep, uninterrupted by children, pets, or electronics. Leave the cellphone alone. Shut it off if you have to. Sleep is rest time, not "go on stand-by alert" time. This one rule is the MOST important. Ignore it, and your attacks will never be resolved.
Feed yourself, feed your soul. Have good meals that sustain your vitamin needs and taste good, and take time for simple pleasures or hobbies that you keep putting off. Take half hour naps. Take a walk with a friend. Learn how to properly meditate. Meditation is very good, but takes practice. Give yourself room to succeed. Panic sufferers tend to over-obligate themselves. Remember this motto: An emergency on your part does not automatically make it an emergency on my part.
If you need help, find a good psychiatrist. This is not easy, because panic attacks are not easy to quantify or diagnose. It's elusive, and doesn't fit into a peg hole neatly. There are so many degrees of anxiety that Generalized Anxiety Disorder gets lumped together with it. If the psy-doc sends you to a "social worker", be warned. Supposedly, a social worker is now a "therapist" by their standards. Personally, not one social worker has been worth anything at all (in my experience). I'm betting the insurance companys worked to make things this way too to increase their bottom line.
A good psychiatrist will be one that can face you honestly and recognize the symptoms. Ask them up front if they've had any experience with it, and if they haven't, find another. If they prescribe a maintenance drug to bring the attacks under control, don't be your own worst enemy. Take them faithfully, and regularly. They will be most effective that way. Some drugs can take a month to get up to full speed, so be prepared to endure for a bit before relief comes. It may take a few tries to find the right medication too; one that works and doesn't knock you out. Generally speaking, the drugs are "mood levelers".
This is not all I could say about PD or GAD, but it's a heckuva good start.
Good luck and many calm days to you, moving forward.
InuNoTaisho (Lord of Dogs)