What could this pain be?

Okay, someone please tell me they've experienced this. I was grocery shopping and out of nowhere I get sharp pain on my right side. After a few minutes I can barely walk. I took a few minutes to just collect myself and kept walking but I couldn't walk standing straight up. Im still having the pain but not as severe. What could this pain be? I'm trying not to freak out about appendicitis because this is the only symptom I'm feeling. Just need some input to calm my nerves.