Sleeplessness and depression are probably effecting your other issue. Seeing your pdoc is the best thing. About the relationship and work issues, I have imposters syndrome, I see my achievements as somehow undeserving that I am fooling people in thinking I am better than I feel I am, like a fake. Relationships are the same, I don't value my positive assets as a person, inside I think that I am putting on a facade, being in a relationship would expose me as a fraud.