Hypertension, Pregnancy, Preeclampsia??

I am fifteen weeks pregnant, And for my last two visits my blood pressure has been high. like 150/100, 140/90. My OBGYN told me I am a candidate for pre eclampsia. I can be a really negative person and I just feel like I am doomed! It's hard for me to remain calm and not stressed because I have a lot going on right now and my life is just stressful. What are my odds of avoiding this disease. If my OBGYN monitors me closely, can I prevent the major dangers of preeclampsia if I were to get it?