The plural is anxieties (e.g. He has been treated for various anxieties over the years).
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There's a field of psychology called "music therapy." Music can
help relieve anxieties and other feelings, and it can help make
people happier.
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Your dream only expresses your own thoughts, feelings and
anxieties. Your dream does not tell you anything about the future
or provide any insight into what your in-laws are thinking or
feeling.