I too took DEX,  I think around the same dosage?  It was 8 years ago....I had an amnio, at that time the CVS was very new and not available to me.  Anyway I had a very simillar reaction to the DEX,  very moody!  I threw my purse at my husband.  Funny now, at the time I was so mad.  I am usally very calm.

I did not get any stretch marks though-

I have two SW CAH boys,  I found out at about 20 weeks I was having a boy and started weaning off the DEX.

Both my boys are doing great.

Good luck.