That's so strange, my first freak out was at 27 weeks too (I blogged about it here)

Sorry, not helpful... Um... All I really did (what I am doing) was push through it. If I felt sad, I let myself feel sad. If I was angry, I hit some pillows and raged and cried and all the things I do when I'm angry. Of course you should stay positive, but it can be hard sometimes. Just as long as you accept the huge probability that this baby will be fine, you should be alright. If you're that way inclined, arm yourself with statistics, like I did. Meditate, if you want. If you feel you have to, head to the hospital and get them to hook you up to a heart rate monitor (this may involve having to lie about not feeling bub move, though...) Whatever usually makes you feel better or less scared about normal things, do that.