Allergic Reaction: Given the acute onset of bilateral eye swelling and drainage without pain or itchiness, along with systemic symptoms such as abdominal bloating and chest discomfort, an allergic reaction could be a unifying diagnosis. The presence of an ostomy might increase the risk of certain types of allergic reactions or infections, but the symptoms described could also align with a systemic allergic response.

Infection (e.g., Urinary Tract Infection, Pneumonia): The patient's symptoms of abdominal bloating and chest discomfort, coupled with the presence of an ostomy, could suggest an infection. UTIs are common in older adults and can cause systemic symptoms, while pneumonia could explain the chest discomfort.
Gastrointestinal Issue (e.g., Constipation, Partial Bowel Obstruction): The abdominal bloating and the presence of an ostomy suggest that a gastrointestinal issue could be a contributing factor. Constipation or a partial bowel obstruction could cause bloating and discomfort.
Cardiovascular Issue (e.g., Heart Failure): Although the chest discomfort does not radiate, conditions like heart failure could cause systemic symptoms including eye swelling (due to fluid overload), abdominal bloating, and chest discomfort.

Sepsis: Given the patient's age, presence of an ostomy, and systemic symptoms, sepsis is a critical diagnosis not to miss. Sepsis can present with non-specific symptoms and can rapidly progress to a life-threatening condition.
Pulmonary Embolism: Although the chest discomfort does not radiate, pulmonary embolism is a diagnosis that must be considered, especially in older adults with potential risk factors for thromboembolic events.
Cardiac Tamponade or Myocardial Infarction: These are life-threatening conditions that could present with chest discomfort and systemic symptoms. Although the discomfort does not radiate, these conditions require immediate diagnosis and treatment.

Wegener's Granulomatosis (Granulomatosis with Polyangiitis): This is a rare autoimmune disorder that can cause a wide range of symptoms including eye inflammation, abdominal symptoms, and chest discomfort due to its effect on blood vessels.
Superior Vena Cava Syndrome: This condition, often associated with malignancy, can cause facial and eye swelling due to obstruction of the superior vena cava. It's a rare condition but could explain some of the patient's symptoms if considered in the context of a malignancy or other obstructive process.