In what ways is Gregor's metamorphosis symbolic in Kafka's The Metamorphosis?

There is a
great deal of symbolism in Kafka's . One example is the question of whether
Gregor's transformation is symbolic of his sense of alienation? Is he a bug or is he simply
feeling alienated from all those around him in that he is not appreciated?

The first line of the story begs the question of whether the story is a
dream:

As Gregor Samsa awoke one morning from uneasy
dreams he found himself transformed in hi bed into a gigantic insect.

There is supposed to be a great deal of symbolism in dreams, so
Kafka may be suggesting, by introducing the possible presence of a dream,...