Existential Issues & Meaning

When a long-term belief you were settled upon appears to be at odds with more recent perceptions of reality. The actions and thoughts you had previously aligned to the old system of belief are rendered pointless or obsolete. It becomes so much of an issue it becomes impossible to conceive of way you can continue. The meaning of your existence past, present and future starts to have an enormous amount of doubt attached to it and it feels like you living in a dream, but in waking life.