OMG, no one read a word I wrote. Solipsism is NOT what we experience. It is a Philiosophical DEBATE. So is Nihilism.
There is no diagnosis of Solopsism or Nihilism, and no one who has studied these concepts and writes about them develops DP!
Nihilism (/ˈnaɪ.ɨlɪzəm/ or /ˈniː.ɨlɪzəm/; from the Latin nihil, nothing) is a philosophical doctrine that suggests the negation of one or more reputedly meaningful aspects of life. The Greek philosopher and Sophist, Gorgias (ca. 485 BCE–380 BCE), is perhaps the first to consider the Nihilistic belief. Most commonly, nihilism is presented in the form of existential nihilism, which argues that life is without objective meaning, purpose, or intrinsic value. Moral nihilists assert that morality does not inherently exist, and that any established moral values are abstractly contrived. Nihilism can also take epistemological or ontological/metaphysical forms, meaning respectively that, in some aspect, knowledge is not possible, or that reality does not actually exist.
The term is sometimes used in association with anomie to explain the general mood of despair at a perceived pointlessness of existence that one may develop upon realising there are no necessary norms, rules, or laws. Movements such as Futurism and deconstruction, among others, have been identified by commentators as "nihilistic" at various times in various contexts.
Nihilism is also a characteristic that has been ascribed to time periods: for example, Jean Baudrillard and others have called postmodernity a nihilistic epoch, and some Christian theologians and figures of religious authority have asserted that postmodernity and many aspects of modernity represent a rejection of theism, and that such rejection of their theistic doctrine entails nihilism.
You can go to university to study nihilism and existentialism and solipsism. You go to medical school to study dissociative disorders.
THESE ARE NOT THE SAME THING. GAH.
I give up.