Small Bowel Cancer Diagnosis

I have had 4 CT Scans and a PET Scan. 2 of the Scans came back with an impression of malignant carcinomatosis and 2 came back with no cancer impressions but possible chrohns or some other issue. The PET scan came back with no high activity for cancer anywhere in my body. I went to my General Surgeon and he told me he is almost 100% sure it is some form of Small Bowel Cancer. My current symptons are abdomen pain in right lower quadrant and horrible spasms with gurgling. I have had blood work done and everything came back perfect. I also have not lost weight, have an appetite, no vomitting..etc. I have, however, had long term diarhea and lower right pain that i atributed to a hip problem. I have done extensive research and it sounds like if i do have cancer it would be aNeuroendocrine tumor. Has anyone had this type of situation? I have only had the spasms for a month. My assumption is that if it was advance active cancer i would have horrible blood work and be exibiting all of the normal symptons. Thanks in advance.