Rapid weight gain

I've gained a total of 51 pound as off today (35 weeks) I have 5 more weeks to go and I'm starting to concern about this rapid weight gain. I was tested negative for gestational diabetes, and no preeclampsia so far. My blood pressure is always normal and urine test always shows normal results for protein. I'm swelling a lot, puffy hands, puffy feet and ankle. I walk everyday and I'm trying to watch what I eat. But I confess I eat bread and sweets which my doctor told me to avoid. Has anyone gone through anything similar? I'm just embarrassed every time I go to my appointments I don't know what to do. Here's the picture of last week, I don't care about my body, I just want a healthy baby. Should I worry?