Relatively new to pericarditis, pain under lowest left ribs

Hello, I was diagnosed with pericarditis about 3 weeks ago, with a lot of chest pain and also back pain which increased greatly if I tried to lie on my back at all, and radiated into my left shoulder. I am a woman, late 60s, with a history of one heart attack, from which after several years I had seemed to heal completely and I was back to my normal activities and exercising. Now, I don't know what could have set off this pericarditis. Currently I am still really fatigued and almost all of the pain has moved to an area right under my lowest left rib area. That pain is sharp at times, other times not though, but I cannot lie on my right side because it sets the pain off in a major way - which is weird - since the pain is only on the left. My doctor has me on colchicine and tylenol (I can't take NSAIDS). I am feeling like I am at a standstill where pains in the chest/back have mostly gone, but the pain under my left ribs is still there and hanging on. My doctor just shrugs her shoulders and says it is probably part of the pericarditis. But has anyone else had pain under their lowest left ribs caused by the pericarditis?