Chris, that sonds awful. And I don't understand either how they could release you when your BP was still so high and with you still unable to keep anything down.
Not sure what to suggest... Plan A: go to GP and get a referral to someone who will be able to help you. Plan B: go back to emergency and get yourself checked again and hopefully admitted for longer than 8 hours. They must see how concerned you are for yourself and your baby. I want to give you a big hug!! You are putting up with so much!!!