Cholecystitis with referred pain: The presence of a contracted gallbladder (GB) along with hepatomegaly and pain in the chest and abdomen, particularly on the left side, could suggest cholecystitis. The pain from the gallbladder can refer to the chest and left side of the abdomen due to shared nerve roots.

Gallstone disease: Gallstones could cause a contracted gallbladder and hepatomegaly if there is a blockage in the bile ducts. The pain pattern can vary but often includes the right upper quadrant and can radiate to the back or right shoulder.
Hepatitis: Inflammation of the liver (hepatitis) can cause hepatomegaly and pain. While hepatitis typically causes right upper quadrant pain, it can sometimes be more diffuse or even cause referred pain to the chest or left side.
Pancreatitis: Pancreatic inflammation can cause abdominal pain that radiates to the back and can also cause hepatomegaly if there is associated liver involvement. The pain is often more central but can be on the left side, especially if the tail of the pancreas is involved.

Pulmonary embolism: Although less likely given the hepatomegaly and contracted GB, pulmonary embolism can cause sudden onset of chest pain and can be associated with abdominal pain if there is associated bowel ischemia or other complications. It's a critical diagnosis not to miss due to its high mortality rate.
Aortic dissection: This is a life-threatening condition that can cause severe chest and abdominal pain. While it might not directly explain the hepatomegaly or contracted gallbladder, it's a diagnosis that cannot be missed due to its urgency and potential for fatal outcomes.
Sickle cell crisis: In patients with sickle cell disease, a crisis can cause multi-organ dysfunction, including hepatomegaly and pain in various parts of the body, including the chest and abdomen.

Amyloidosis: A condition characterized by the deposition of amyloid proteins in various organs, including the liver and gallbladder, leading to hepatomegaly and potentially a contracted gallbladder. It's a rare condition but could explain the combination of findings.
Intrahepatic shunts or vascular malformations: Rare vascular anomalies within the liver could potentially cause hepatomegaly and might be associated with a contracted gallbladder if there's altered blood flow or pressure affecting the biliary system.
Polycystic liver disease: While more commonly associated with renal cysts, polycystic liver disease can cause hepatomegaly. It might not directly explain the contracted gallbladder or the specific pain pattern but is a rare condition that could be considered in the differential diagnosis.