Severe pain in ribs, is it GERD or something else?

I’m currently on meds for GERD, but I don’t think that’s what I have. In the past 4 months, I’ve had 6 episodes in which I had severe pain in my ribs, just below the breasts (right where the bra band is), predominately on the left side. It starts late at night/early in the morning. 5/6 times, it woke me from sleep, the 6th time, I was awake when it started. It’s usually a cramping pain, ranging 8-10 in severity (out of 10). Half of the episodes included vomiting. During the most recent episode, there was slight relief after vomiting. The pain lasts 1-3 hours. It just stops after a while. I’ve been to the ER for the pain twice now. Nothing abnormal in the chest x-ray. Blood work came back normal (aside from very mild anemia). I’ve had about 5 EKG/ECGs now. Each one, I was told everything was normal. My doctor looked at the first one and the most recent one and said there was an increase of strain on my heart. I occasionally have heart palpitations too. The same foods do not consistently overlap with the episodes. Before one episode, I had eaten pizza. The next day, I had pizza again (from the same pizza) and I didn’t have any pain. I tend to eat the same foods over and over again, but nothing has consistently aligned with the pain episodes. My question is: Does this sound like GERD or acid reflux at all? I don’t have heart burn.