Preeclampsia Vs. Gestational Diabetes?

I am 36 weeks 5 days. Since my last OB visit on thursday my feet and face have swelled up severely, I have put on 8 pounds, used the restroom the least I have this entire pregnancy, had a raised baseline blood pressure (has been for 2 weeks now), and when she checked on thursday this was also the 2nd week I have had protein in my urine. I have been having pain in my stomach for about a month now (since august 2nd), she says they are NOT contractions (they feel like food poisoning) and according to just about every source this points to preeclampsia. My doctor had me keep track of my blood sugar over the weekend (saturdays were 75, 110, 130, 90, 130, 115 (rounded up)) She has ordered the A1C test and sent me to a diabetic educator. I don't understand why. My father-in-law is diabetic and I know about diabetes and this is definitely not diabetes. I am going to go to the appointment to humor her. Is there some hidden truth in what she is saying? When I called today I told her nurse everything that was going on and when they called back they completely ignored what I suspected. Whats going on? Am I off base about preeclampsia or do doctors normally ignore it?