Are endoscopy and CT scan enough for detection of any serious disease in abdomen along with ultrasound, urine and blood test? All came negative.

Nothing. Is 100% in medicine but, as all your tests are negative, it would be reasonable to look at this positively. Certain problems, such as irritable bowel syndrome, can cause symptoms and will not show up on tests.

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Can liver functions checked by blood test prvide indcation of liver tumor or is it is mostly detected by ultra sound and CT scan?

Need imaging. The blood tests can give us an indication that something is wrong in the liver but you really need some sort of imaging to see a tumor. This could be US, CT scan or MRI. Usually doctors start with an ultrasound. Read more...