Been waking up with no hearing on left ear for a week. It feels like when you get water inside. No pain or discharge. Should I be concerned?

Yes. Sudden loss of hearing may be serious, or it may be something as simple as too much wax in your ear, which can easily be removed by your doctor with irritation.. You need to be checked to find out what is causing this, and then you can be given the most appropriate treatment. Never use Q-tips to clean your ears. It can cause the wax to become packed in, or cause an infection.