I'm sorry to hear you're experiencing throat infection symptoms along with difficulty swallowing, heaviness in your head, and thick phlegm. These symptoms suggest an infection that may need proper evaluation and treatment.

Here are some steps you can take:

• Rest and Hydration: Drink plenty of warm fluids like herbal teas, warm water with honey and lemon, or soups to soothe your throat and help loosen phlegm.
• Pain and Fever Relief: Over-the-counter pain relievers such as paracetamol (acetaminophen) can help reduce throat pain and any fever you might have. However, use them as directed and avoid alcohol while taking these medications.
• Gargling: Gargle with warm salt water several times a day to reduce throat inflammation and discomfort.
• Avoid Irritants: Stay away from smoke, strong odors, and cold air that can worsen throat irritation.
• Humidify Air: Using a humidifier or inhaling steam can help ease congestion and throat dryness.

Since difficulty swallowing and head heaviness can sometimes indicate a more serious infection or complication, it is important to see an ear, nose, and throat (ENT) specialist or a general physician promptly. They can examine you, possibly perform tests, and prescribe appropriate treatment such as antibiotics if a bacterial infection is suspected.

If you experience worsening symptoms like high fever, severe pain, difficulty breathing, or inability to swallow liquids, seek emergency medical care immediately.

Please consult a doctor soon to get a proper diagnosis and treatment plan tailored to your condition.To narrow down potential causes, we will need some more information.Please tell me your age and gender.