Do preeclampsia symptoms come and go or are they constant?

I'm curious because I have had high BP at every doctor appointment except one. They have been worried about preeclampsia with me. I have been having the swelling of hands and feet, upper right quadrant pain (I've already had my gallbladder removed, so it's not that), headaches, and spotty vision. All my symptoms have been off and on so I'm not sure if I should be concerned or not. My next OB appt is Friday the 30th. Should I wait till my appt? I'm 36 weeks today. Comments and advice welcome!