Hello, It is unlikely that the Statex (morphine) is the cause of your heartburn. I suggest trying it again if your arm pain is not sufficiently relieved by Tylenol. There is no contraindication to using a probiotic like Probaclac with Dexilant. Taking probiotics is unlikely to reduce your painful stomach symptoms, but you may still want to try them. Follow the dosage written on the bottle. Additionally, consider if your stomach pain could be related to the food you eat. We look forward to seeing you.