Preeclampsia?

I am 24 weeks pregnant and have had pain near my upper right ribs and around to my back for about a month now, dr told me it was costochondritis. The last week or so I have been getting super blurred vision for about 30-45 mins then a horrible headache afterwards. Any one know what this might be or know what I should do? My hubby is supposed to be getting a bp cuff today when he gets off work.