Gastetional diabetes high blood

I’m 34 weeks and my blood is going high before I had very good blood sugar before 30 weeks and I ate life cereal and my sugar was 205! My blood has never been this high during my pregnancy . The highest I’ve had was 145 now it’s sky rocketing tomarrow I have an appointment so I’ll talk to my dr but right now I’m curious what should I do ? I know I need to eat healthier now as in no cereal or fruit or potatoe. I pretty much can only eat egg whites water and meat without my sugar going crazy Its scaring me ive been having swollen feet for a week . It’s this life threatening will my. Baby come out sick ? I’m scared what will happen ? For lunch I’m eating eggs only