If your insurance allows, go directly to a gastroenterologist, who can diagnose a hernia and refer to a surgeon if necessary. Two different PCPs treated me for GERD symptoms for more than 10 years and never found my hernia. When I relocated cities and went directly to a gastroenterologist, she found the hernia right away. She foundation a paraesophogeal hernia the size of a baseball wrapped around my esophogeus. The hernia was found during an endoscopy procedure and the size was later confirmed with an upper GI x-ray.
Mine was repaired by a general surgeon. My PCP referred me to him after a physical exam.
Your PCP is enough, just by feeling where you think he has it, they can diagnose. Of couse confirm with a ultrasound.