My Friend started losing weight rapidly, loss of appetite, the smell of food would make her sick, no energy, etc. and this went on for several months. She finally went to the doctor 1/07 and was told she had an ulcer which then turned into a bleeding ulcer. The doctor said the ulcer needed to be removed and she had that surgery on 2-14-07 and at that time the doctor discovered she also had mestastis pancreatic cancer (also in the liver).
Please go to the doctor and get checked out. With your family history I would not put off the visit to the doctor any longer.
God bless and good luck.