Hello and welcome. Alcohol consumption can easily cause gasteic irritation and the development of conditions like gastritis, peptic ulcer disease, etc. So the discontinuation of alcohol can also trigger the symptoms of a possible underlying condition, speak to your doctor about the same to initiate treatment with antacids and lifestyle modification. As for the stress and anxiety, this is to be expected and I would recommend you to go ahead with counseling sessions which should be part of any detox regimen. Speak to your doctor, who shall help guide you through this healthy and hopefully life changing process. Best wishes.