i second the homeopathy and accupuncture. also lavendar essential oil is very calming. get a bottle of the oil from a health food store and just take a whiff or rub some on your wrists when you feel panicky. it's very gentle and good for you and baby. Trader Joes makes a great lavendar oil spray. i love it.
one other alternative thing that has helped give me something to do to help calm down and redirect my brain is EFT-- Emotional Freedom Technique. It's a series of accupuncture meridians that you tap while saying a positive statement like "even though I'm freaking out I love myself fully and completely" It's corny, and seems a little rediculous... but very simple and has helped me. You might find it on youtube or there is probably a website or something about it.
i have had panic attacks, and i remember how scary they were. hang in there, i hope you learn how you can cope with them!