What are signs of preeclampsia?

What are some signs of preeclampsia beside high blood pressure and protein in your urine? And how do you tell if you do have high blood pressure?

Past week I have been feeling really dizzy and nausea. I wake up feeling dizzy. I do have a bad headache that hasn't gone away but I cant tell if its just a normal headache that i have. (I do have past with headaches not going away) I do plan on talking to my doctor at my next appointment.