Ooooh - part of me is envious as I am one who finds it so difficult to lose weight!
However I can see that you are worried by this & indeed it certainly isn't normal. I would imagine that if anything very serious was amiss it would show up in the blood tests but still I think you are very wise to be getting the CT scan plus all the other tests. Have they checked your thyroid?
I can imagine your family would be freaking out a bit! Don't ever feel you are a 'hypochondriac' just because you are asking about real concerns that you & your family have about your health! Your Doctor is there to listen, test, diagnose, treat & reassure! Let us know how you go!