Gastroesophageal Reflux Disease (GERD): This condition is characterized by stomach acid frequently flowing back into the tube connecting the mouth and stomach (esophagus). Symptoms can include bloating, discomfort, and a sensation of air in the mouth due to belching. Dizziness and fatigue can also be present due to discomfort and potential sleep disturbances.

Irritable Bowel Syndrome (IBS): IBS can cause bloating, gas, and discomfort, which might lead to feelings of dizziness due to abdominal pain or discomfort. Fatigue is also a common symptom in IBS patients.
Anxiety or Panic Disorder: These conditions can cause a range of physical symptoms including bloating, dizziness, and fatigue. The sensation of air in the mouth could be related to hyperventilation, a common symptom during panic attacks.
Food Intolerance: Intolerance to certain foods (like lactose or gluten) can lead to bloating, gas, and discomfort. These symptoms might indirectly cause dizziness and fatigue.

Myocardial Infarction or Cardiac Issues: Although less likely, it's crucial not to miss cardiac issues, as they can be life-threatening. Sometimes, atypical presentations of heart attacks can include vague symptoms like bloating, dizziness, and fatigue, especially in women or diabetic patients.
Pulmonary Embolism: This is another potentially life-threatening condition that might present with non-specific symptoms including dizziness and fatigue. While bloating and air in the mouth are not typical symptoms, it's essential to consider this diagnosis, especially if there are risk factors or other suggestive symptoms.

Gastroparesis: A condition where the stomach takes too long to empty its contents. Symptoms can include bloating, nausea, and feeling full after eating only a small amount of food, potentially leading to fatigue and dizziness.
Mitochondrial Myopathies: Rare genetic disorders that affect the mitochondria, leading to muscle weakness and fatigue. Gastrointestinal symptoms, including bloating, can also occur in some types of these disorders.
Ehlers-Danlos Syndrome: A group of disorders that affect connective tissues supporting the skin, bones, blood vessels, and many other organs and tissues. Some types can lead to gastrointestinal issues, including bloating, and potentially to fatigue and dizziness due to various systemic effects.