Check out the books "Panic Attacks Workbook" by Dr. Dave Carbonell
and "Hope and Help For your Nerves" by Dr. Alice Weekes.
Both of these books are great and are helping me towards recovery. Not there let but I am better than i was a month ago for instance.
Dr. Weekes says to use the following technique
F- Face
A-Accept
F- Float (Float through the panic, let it flow through you while you are sitting down, let your muscles go limp and let it flow through you while you thinking about floating through the panic)
T- Time (Let time pass, it takes time for recovery. dont be impatient.
Dr. Dave Carbonell uses a similar technique called AWARE
A- Accept
W- Wait and Watch ( similar to floating)
A- Actions (go LIMP with your muscles and try belly breathing)
R- Repeat (repeat the steps)
E- End. Realize all attacks end whether you do something or not. So try to do nothing instead of fighting it and making it worse