Based on the symptoms described, the likely diagnosis is Otitis Externa, also known as Swimmer's Ear. Otitis Externa is an infection or inflammation of the ear canal, typically caused by bacteria or fungi. The symptoms of ear discomfort, itching, gradual onset of deafness, and worsening at night are consistent with this condition. The presence of ear discharge further supports the diagnosis. The fact that the tympanic membrane (TM) is not visible suggests that the infection or inflammation is localized to the external ear canal.