Yes. Most endoscopies are performed with light sedation, utilizing an analgesic and sedative. These two usually do very well alone. These are not considered as general anesthesia. There is an anesthetic commonly used though for these types of procedures that has a greater sedative effect. It requires an additional health care provider to be present though. Endoscopies are low risk & well tolerated.
Yes. You will have an IV and be sedated.
Yes. Depending on the type of endoscopy being performed, anesthesia is available and frequently used. However, this may not adequately address why you are afraid. Being afraid of complications, pain, cancer, etc. Are all valid fears but anesthesia only addresses pain. You should consult with your doctor about your fear as well as inquire about the types of anesthesia available.