Endoscopy/colonoscopy nervous, where can i get my questions answered?

Gastroenterologist: These two procedures are most often performed by a gastroenterologist. The most common procedure performed after age 40-50 is a screening colonoscopy to examine the bowel for possible premalignant lesions. If neg. a follow up at 3-5 yrs may be suggested. Endoscopy or usually gastroscopy is performed for upper GI symptoms including pain , vomiting upper GIbleeding