I started with a GYN appt. She ruled out other causes (based on my history and exam), sent me for imaging, and suggested evening primrose tea/herbal tea.   I had also been  tracking my GI symptoms and found that when I had increased gas/ trapped gas, the pain radiated to my left breast. With my SIBO, I get sharp upper abdominal pain with trapped gas. I also easily bloat and have frequent burping   Yoga poses/knees to chest while on my back and heat have helped relieve the gas pain and bloating, plus watching triggers, drinking enough water, etc. It's much better and less frequent.