What could cause chronic (2-7 years): coughing, swollen left lymph node, headaches, constipation, fatigue, anxiety, depression, insomnia, "brain fog"?

GERD: Gastro esophageal reflux disease associated with constipation. Change diet, avoid spicy , fried, citrus food, white chocolate peanut. Coffee soda condiments. Over the counter antacid twice a day, sleep inclined , avoid late dinner, eat small meals and chew your food very well. What to eat ? High fiber green vegetable beans lentils. Drink more water. Use laxative like metamucil twice a day . I.