Was referred to gastroenterologist for positive FIT test (occult blood). Was told to do EGD/colonoscopy but I refused the tests. Anything uninvasive?

Noninvasive. Noninvasive studies of the colon include a virtual colonoscopy involving ct scanning and an air contrast barium enema. For study of the esophagus and stomach, a barium swallow and upper gi series can be done. However these older studies may miss smaller lesions.