I will simply say the sinking feeling is a feeling you get when things are bad or about to be bad. It is a negative feeling and the whole point of the sinking feeling is that it weighs you down, hence the word sinking.
People who experience a feeling of impending doom may feel like something tragic or life-threatening is about to happen. It is a heavy, sinking feeling that can be overwhelming. A feeling of impending doom can be a symptom of anxiety and affect your mental health and quality of life. Link
The reason for this kind of feeling varies and can be caused by many factors, most are personal reasons of course. So, the sinking feeling is meant to change your entire mood to a weak and hopeless one.
Which is why I will advice not to let your feelings control your actions because they can lead you to do things you may not be proud of in the end when your feelings are back to normal.
We know the sinking feeling is not good, so avoid such feeling at all cost.
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