Fed-up “Fight Club” star Edward Norton had an amateur paparazzo get in his face in Midtown this week, and the actor sent the guy to the hospital to whine about a sore finger, law enforcement sources told The Post yesterday. Norton, 43, was walking along 57th Street near Seventh Avenue about 12:05 p.m. Tuesday, reports The Post’s Jamie Schram, when Lower East Side pest Alain Becerra-Calderon started following him, brandishing his cellphone camera. “I got a quick question: ‘People say you look like me. Is that true?’ ” Becerra-Calderon repeatedly asked, sticking his phone in the actor’s face. “Why are you stalking me?” Norton replied before finally snapping and shoving the camera away, according to Becerra-Calderon’s own video of the dust-up. The accused stalker, who under the name Alain Bin Naim produces videos on a YouTube channel, then had the nerve to complain to cops that Norton attacked him. He also scurried to Beth Israel Hospital, where a doctor said he suffered a “tissue contusion” on his middle finger. The doctor told cops the kooky publicity hound insisted on getting a splint for his finger because he was in so much pain. Now, the NYPD is investigating Norton for “harassment,” a source said. When reached for comment, Becerra-Calderon said the exchange was “very, very scary” and the actor “needs to learn to control his temper… I asked if I could ask a question, and he grabbed my phone.” He said his finger’s “bruised” and, “the hospital even had to put a bandage on it.” When asked whether he’s exploring legal action, the YouTube boob said, “I’m discussing that with my attorney.”