Diabetic Ketoacidosis (DKA): This condition is characterized by hyperglycemia, metabolic acidosis, and ketosis, often presenting with nausea, vomiting, and abdominal pain. The presence of hypertension could be due to dehydration or an underlying condition. DKA is a common complication of diabetes and fits well with the symptoms described.

Hyperglycemic Hyperosmolar Nonketotic Syndrome (HHNS): Similar to DKA but without significant ketosis, HHNS presents with severe hyperglycemia, dehydration, and altered mental status. Nausea and sweating can be part of the presentation, and hypertension might be seen due to dehydration or underlying conditions.
Pheochromocytoma: A rare tumor of the adrenal gland that secretes excess catecholamines, leading to episodes of hypertension, sweating, nausea, and potentially hyperglycemia due to the effects of catecholamines on glucose metabolism.
Hypertensive Crisis: A severe increase in blood pressure that can lead to end-organ damage. It can present with nausea, sweating, and potentially hyperglycemia due to stress response.

Myocardial Infarction: Although not directly linked to hyperglycemia as a primary cause, myocardial infarction can present with nausea, sweating, and hypertension. Hyperglycemia can occur due to the stress response of the body to acute illness.
Stroke: Similar to myocardial infarction, a stroke can present with sudden onset of hypertension, nausea, and sweating. Hyperglycemia might be seen as a stress response.
Septic Shock: A life-threatening condition that arises when the body's response to an infection injures its own tissues and organs. It can present with a wide range of symptoms including hypertension or hypotension, nausea, sweating, and hyperglycemia due to the stress response and potential adrenal insufficiency.

Cushing's Syndrome: A hormonal disorder caused by prolonged exposure of the body's tissues to high levels of the hormone cortisol. Symptoms can include hypertension, hyperglycemia, and potentially nausea and sweating due to the metabolic effects of cortisol.
Thyroid Storm: A life-threatening complication of untreated or undertreated hyperthyroidism. It can present with hypertension, hyperglycemia, nausea, vomiting, and sweating among other symptoms.
Adrenal Insufficiency: Although more commonly associated with hypotension, in the early stages or with certain types of adrenal insufficiency, patients might experience hypertension. Nausea, sweating, and hyperglycemia can also be present due to the body's stress response and metabolic derangements.