Viral Upper Respiratory Infection (URTI): Given the symptoms of sore throat, congestion, and body aches, along with the patient's age and presentation, a viral URTI is the most likely diagnosis. The fact that albuterol did not help suggests that the asthma is not the primary issue at this moment, or the symptoms are not solely due to asthma exacerbation.

Asthma Exacerbation: Although the patient tried albuterol without relief, an asthma exacerbation could still be a contributing factor, especially given the history of asthma and difficulty breathing. Other asthma medications or a different approach to managing the asthma might be necessary.
Influenza: The symptoms of sore throat, congestion, body aches, and difficulty breathing could also be indicative of influenza, especially during flu season. The lack of response to albuterol does not rule out influenza, as it primarily affects the lower respiratory tract and would not respond to bronchodilators.
Acute Bronchitis: This could be another possibility, especially if the patient has a productive cough, which is not mentioned but could be part of the presentation. Acute bronchitis often follows a viral upper respiratory infection and could explain the difficulty breathing if the bronchitis is severe.

Pneumonia: Although less likely given the initial presentation, pneumonia is a critical diagnosis not to miss due to its potential severity and need for specific treatment, such as antibiotics. The difficulty breathing and potential for high fever (not mentioned but possible) make pneumonia a diagnosis that must be considered.
Epiglottitis: This is a rare but life-threatening condition that can cause severe difficulty breathing, sore throat, and other symptoms similar to those presented. It requires immediate medical attention and is more common in children but can occur in adolescents.
Pertussis (Whooping Cough): Given the cough and difficulty breathing, pertussis should be considered, especially if the patient is not up to date on vaccinations or if there is a local outbreak.

Myocarditis or Pericarditis: These conditions can present with difficulty breathing and chest pain (not mentioned but possible) and are rare but serious complications that could occur, especially in the context of a viral infection.
Interstitial Lung Disease: This is a broad category of diseases that affect the interstitial spaces of the lungs and could present with difficulty breathing. However, they are rare and typically have a more chronic presentation.