Irritable Bowel Syndrome (IBS): This condition is characterized by recurrent abdominal pain, bloating, and changes in bowel movements. The symptoms described, such as bloating and gas pains in the abdomen, are classic for IBS. The upper mid back spasms could be referred pain from the gastrointestinal tract or musculoskeletal tension secondary to abdominal discomfort.

Gastroesophageal Reflux Disease (GERD): GERD can cause abdominal discomfort, bloating, and gas pains. The reflux of stomach acid into the esophagus can also lead to referred pain in the upper back.
Functional Dyspepsia: This condition involves recurring signs and symptoms of indigestion that have no obvious cause. Symptoms can include bloating, gas, and upper abdominal pain, which may radiate to the back.
Small Intestine Bacterial Overgrowth (SIBO): SIBO occurs when there is an abnormal increase in the bacteria that inhabit the small intestine. Symptoms can include bloating, gas, abdominal pain, and potentially back pain due to referred pain or musculoskeletal issues.

Myocardial Infarction (MI) or Cardiac Ischemia: Although less common, it's crucial to consider cardiac causes, especially if the patient has risk factors for heart disease. The pain of an MI can sometimes be referred to the abdomen or back.
Pulmonary Embolism: Severe cases can cause sudden onset of back pain and may be accompanied by abdominal symptoms if there is associated panic or stress response.
Pancreatitis: Inflammation of the pancreas can cause severe abdominal pain that radiates to the back. Bloating and gas could be secondary symptoms.
Cholecystitis or Cholelithiasis: Inflammation of the gallbladder or gallstones can cause right upper quadrant abdominal pain that may radiate to the back and be accompanied by bloating and gas.

Inflammatory Bowel Disease (IBD): Conditions like Crohn's disease and ulcerative colitis can cause chronic inflammation of the GI tract, leading to symptoms including bloating, gas, abdominal pain, and potentially back pain.
Celiac Disease: An autoimmune reaction to gluten can cause small intestine damage, leading to malabsorption and symptoms like bloating, gas, and abdominal pain.
Gastroparesis: Delayed stomach emptying can cause bloating, nausea, vomiting, and abdominal pain, which might be referred to the back.
Sphincter of Oddi Dysfunction: Abnormal function of the sphincter of Oddi, which controls bile and pancreatic juice flow, can cause recurrent biliary-type abdominal pain and potentially back pain.