I am a 20 month Whipple survivor..... Had the same problems, minus vomitting. I take enzymes and they clear up alot of the problems, surgeon and oncologist said to stay away from sugar which I do most of the time. Once in awhile I splurge.
I'd get back to that Doctor or Oncologist fast and make him find out what is going on. There is no need for him to be going through this.