<s>[INST] Tightness back of my chest(upper back). Feels like muscles are tight in my chest. Left neck pain with lump along the veins. Head pain. Anxiety. Fatigue. Pain under rib cage. Tightness in left chest(around heart). Bloating. Indigestion. Muscles pain. Heart result was normal. [/INST] Thanks for your question on Chat Doctor. I can understand your concern. In my opinion, you are mostly having HERD (gastroesophageal reflux disease). It is due to laxity of gastroesophageal sphincter. Because of this the acid of the stomach tends to come up in the esophagus and cause chest tightness, bloating, indigestion and burning epigastric pain. For his swelling in neck, ultrasound examination of neck is needed. Because neck swelling is mostly due to enlarged lymph node. For better symptomatic relief in HERD, follow these lifestyle modifications. 1. Avoid stress and tension. Avoid hot and spicy food. 2. Avoid large meals, instead take frequent small meals. 3. Start proton pump inhibitors and prokinetic Chat Doctor.  4. Go for walk after meals. 5. Keep 2-3 pillows under head in the bed to prevent reflux. Since these  </s>