Hyperventilation problem in pregnancy. What can I take?

Slow deep breaths. Hyperventilation in pregnancy is quite common and usually due to the elevated Progesterone levels normal in pregnancy. This is called "air hunger of pregnancy", and can lead to anxiety and eventually to hyperventilation. You should see your OB doctor to be certain that there is no other problem involved. If the symptoms are due only to air hunger of pregnancy - you have to control it yourself.
Look to diet. Hyperventilation is related to the chemistry of the brain, orginally ascribed to"hysteria". Look to your diet and vitamin intake for you are feeding the baby as well.