Miss Renee,
I was 50 at time of diagnosis. Now 55, almost 56 and I'm OK.
I'm glad you are going for a second opinion, and I hope you are a candidate for surgery after all. I'm surprised the ERCP doctor said you were not a candidate for surgery without a PET scan. I had ultrasound, ERCP and PET scan and then a test to check for main artery/vein involvement (can't remember name of it, they put die in your veins and take images) before they determined agreed I was a candidate for the surgery.
I had similar symptoms as you. I was healthy. Non smoker. Had digestive problems and went to a doctor for help. They gave me Previcid to help with acid reflux. Shortly after that I became jaundiced. In less than two weeks from that, I was in for surgery.
As far as nutrition. My suggestion is to simply eat a good well balanced diet. You may want to eat extra high quality protein , since it seems people with PC often have low protein numbers. Mine were at least. I'm not sure there are any magic food combinations. Just try to eat enough of whatever appeals to you and agrees with your digestion to keep up your strength and maintain your weight if possible.
Another poster mentioned John's Hopkins discussion group. I agree, the folks over there are great and most often quick to respond to questions.
I hope you get good news from the second opinion. Best wishes.