Your post made me think of this article and some of the recommendations may be helpful. It is geared toward youngsters but..
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existential issues are not ones that can be dealt with only once, but rather ones that will need frequent revisiting and reconsideration.

http://www.sengifted.or/articles_counseling/Webb_ExistentialDepressionInGiftedIndividuals.shtml

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A particular way of breaking through the sense of isolation is through touch. In the same way that infants need to be held and touched, so do persons who are experiencing existential aloneness. Touch seems to be a fundamental and instinctual aspect of existence, as evidenced by mother-infant bonding or "failure to thrive" syndrome.

Consider yourself cyberhugged, but is there someone you can ask for an in person hug? Visit the humane society or adopt a pet? Schedule a massage? smile

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Gifted children who feel overwhelmed by the myriad choices of an unstructured world can find a great deal of comfort in studying and exploring alternate ways in which other people have structured their lives. Through reading about people who have chosen specific paths to greatness and fulfillment, these youngsters can begin to use bibliotherapy as a method of understanding that choices are merely forks in the road of life, each of which can lead them to their own sense of fulfillment and accomplishment (Halsted, 1994). We all need to build our own personal philosophy of beliefs and values which will form meaningful frameworks for our lives.
I'm reading about Martin Luther King and it's comforting to know he faced discouragement and self doubt.
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And yet Martin Luther King, Jr.'s wife writes that he was painfully guilt-ridden, continually soul-searching, and loath to be alone. His friends say he would drain them for advice, repeatedly question his own motives, and torture himself with self-doubt. He assumed every hateful remark might have some element of truth, he worried about offending his parishioners, and he felt responsible for mistakes. Still he managed to articulate his own values, to commit to them, and to live them out in the face of violent opposition.