Crying after eating as if uncomfortable

Jennifer

My LO has been crying after eating as if she’s in pain and straightening her legs when she cries. Does this sound like reflux? We burp her every ounce or so and we keep her upright for 20-30 min after feeding (this is when she cries), and she still is crying like this and spitting up. She also is having trouble taking full feeds (so she eats about an ounce and a half every hour) and not taking naps well. Any advice? I’m calling the ped tomorrow but they’re closed for today.