Can someone explain the HOUSE season finale to me?

Everything such happened after he cave within Cuddy's office and make known the "bastard child" criticism was a hallucination. He never asked her because help, they forever went to his apartment, he never detoxed, they forever enjoy sex, also the consequent morning there was not at all lipstick. The lipstick scabbard which he enjoy been frisk with the entire day he was back on office was in fact his Vicodin bottle. What transpired the time between such day at the hospital though, like telling integer the employees that they'd slept together, or gloating on Wilson, Cuddy inspire angry on him, etc. all of that was real. He didn't carry through that he'd been hallucinating down to he confronted her in her office. That's when it percuss him such Cuddy was backlashing at him for what he said almost the baby not about everything such supposedly happened at intervals the two connected with them.