Oh Renee- Welcome! I'm sorry that you had to go through all that! I do know that whenever possible, they will try to wait as long as possible to start the mag until after you deliver because the mag does have such a huge effect on the baby. When I was induced for PE, I was given my epidural as soon as I hit 5cm dialated, because the epidural drops your BP, and then as soon as I had my baby, they started the Mag.
You must have been so sick that they gave you the mag because they thought it was necessary to keep you alive, even though it would be hard on the baby. They must have been really worried about you! And I know they said that baby felt 10x worse than you did- but I know from experience that you must have felt horrible with all that Mag. Thank goodness you and your baby are safe now! I did some searching around, and didn't find any indication at all that baby would have any long term problems because of the mag, and some scientists have thought that mag might even help prevent cerebral palsy in low birthweight babies.
Many women will get preeclampsia with a first pregnancy and then never get it again. For other women, as they age, their problems with pregnancy hypertension will get worse, especially if they have a family or personal history of high blood pressure.
Your doc was probably worried about your immediate postpartum pressures, because the risks of preeclampsia extend into the postpartum period, and you can have postpartum preeclampsia. I was my sickest 10 days after I delivered. After the postpartum period- after 6 weeks- you don't have to worry about preeclampsia anymore, though you'll probably want to check periodically to make sure you're not heading for chronic hypertension. Please take great care with yourself- you've just been through a tremendous experience, and do let us know how you're doing!!
Allie 5-13-98 (35 weeks-pre-e)
Baby Camille 4-17-03 (36 weeks- htn and oligo)