Hi Thanks for posting on HCM Acid reflux/Gastritis always cause chest or epigastric pain that may radiate to arms, shoulders, back and neck.Acute gastritis post dental work(stress) is a normal response and can radiate to all the above mentioned parts.However, not only gastritis can give you these symptoms, gallbladder inflammation , heart problems can also do but the later is less likely since you never mentioned of having any cardiovascular risk factors.I will suggest you try to get a good rest, eat well, take an anti-secretory like omeprazole, an antacid like maalox, drink enough water and observe.If the pains are too intense, you may take a pain medication like paracetamol or celebid.If the problem persist after these, you see a Doctor for examination and some blood tests lke FBC, H pylori and liver function test.An abdominal ultrasound to evaluate the gallbladder may be useful too. Hope my answer will help you Best regards