Any hospital lab can identify a fluke and/or the eggs. If there's a fluke in your system, it's not necessary to actually visualize the critter to verify the existance. It's sure to be depositing eggs into your intestinal system. A stool sample submitted to a hospital laboratory will identify the type of fluke by the specific shape of the eggs found under the microscope.
Incidentially, fluke (Trematoda) infection is EXTREMELY rare in the United States - have you been travelling to a foreign country, eaten uncooked meat or have you gutted a wild animal while hunting? I think maybe there has been a rare transmission by ticks. It's very difficult to transmit from person to person unless by fecal contamination (sh!t).