Hello, I read your message carefully and understood your concern. Let me summarize your medical history to understand things better: - pain in left side of the throat and in the left ear - 3 weeks ago: headache, runny nose, fatigue (head cold) - left ear bugging since the beginning after you felt underwater It looks like you have gone through a common cold before these symptoms appear. It is called head cold when the viruses affect your nose and sinuses only and the symptoms are situated only in the head. Usually, it goes away with supportive treatment by drinking tea and taking over the counter drugs and the situation is settled within a week. Complications of a common cold are rare but they do occur. Sinusitis and ear infection have a great chance to happen after a common cold. Ear and throat are linked with that anatomical structure called Eustachian tube which is a road for infection to pass from throat to ear. When mucous secretions block the throat opening of this tube the pressure inside the ear is raised and causes you ear bugging. A much more sterile fluid gets blocked in the middle ear and predisposes for infection. Staying underwater has put excessive pressure on the ear and you need to give more time until the symptoms disappear. If you have a high body temperature please see your doctor as the infection has already occurred. Make sure to keep clear your throat and nose mucosa from secretions by using menthol sprays and force your immune system with healthy salads and tea. Vitamin C can help too. Wriggling your jaw or blowing a balloon through your nose are simple maneuvers that can help you unclog the Eustachian tube. If the pain is quite heavy and over-the-counter drugs don t help you please see your doctor and do an ear examination. I hope this was helpful