I had Pre E pretty bad too, I gained 20 lbs the last month. My water weight came off very slow and it took my blood pressure FOREVER to come down. I was monitored rather closely, I've heard horror stories about woman being sent home only to have terrible problems and no one will listen to them. I saw my DR once a week for BP checks and the nurses would check it when I went to visit the babies in the NICU. I new when it started to come back down cause the BP meds made me dizzy. I think I was on PB meds for ~2 months, it seemed like FOREVER. FYI I'm a normally healthy person, I'm a runner, eat well and really enjoy exercise. Not sure why I had such a hard time with Pre E.
Hope you recover quickly.