The District of Columbia is a special case. It is not an actual state, and hence does not have senators or congressional representation. It is located between Virginia and Maryland on the Potomac River. It is on the Potomac River between Virginia and Maryland and coextensive with the District of Columbia.
Try waiting it out. Ringing in the ears that is caused by exposure to loud noises usually goes away after a few hours. Take your mind off it by resting and staying away from anything that might exacerbate the symptoms. If the ringing doesn't go away after 24 hours, visit the doctor for further treatment.
Plugged ears can be caused by rapid changes in ambient pressure. This is, again, a result of the auditory tube. Along with the eardrum, the auditory tube helps to equalize the pressure between the middle ear and the outer ear. This is why your ears can feel plugged when you are driving up a steep mountain or taking off in an airplane.