Yolly, I expereinced extreme stress during my pregnancy (especially the latter stages) and even posted on here about it. Alan assured me that it would simply make baby a little more active but would cause no permenent damage. So far, DD is fine. A nice happy bubba.
Some things I tried include guided imagery, exercise, writing, yelling (mostly at DH ), massage, baths. One of the lovely girls on BB sent me some CD's that helped me - I would be happy to forward them on to you - just PM me your details if you would like them.

MG