The Sufi master Hazrat Inayat Khan asserts that congestion causes all illness. Accordingly, illness can be mental or physical congestion, congestions of which a person is aware, such as post-nasal drip, or ones to which she is numb or of which she is ignorant, such as a tightness that has lived in her body for so long that it feels natural or a hatred of someone that feels so right that the hater does not call her heart into question.
Congestion is a lack of space. Space and clarity go hand in hand.
Clarity is a clearing of congestion.
One can get used to their congestion, it can fill the chest, take up space and be comforting. Deceivingly comforting perhaps but comforting none the less. When that congestion is cleared the feeling of emptiness and loss can be excruciating.