Preeclampsia? How were you diagnosed? Can't stop thinking,about,it......

I went to the er yesterday for terrible back and bladder pain. I was in so much pain I was vomiting. But they gave me antibiotics and pain medicine so I started to feel better. Then they tell me that my blood pressure was high and they wanted to monitor it for an hour. I had no protein in my urine, it looked great. But my doctor wants to see me Monday. Before I left the hospital it was going down so I was able to leave. I was curious, how other woman were diagnosed? I feel like my blood pressure could have been so high because my body was so stressed and in pain. I have been worrying since so I feel I'm gonna keep showing high blood pressure. I'm 35 weeks and would really prefer not getting induced.