Will this last forever?

I greened out December 6th, and i still am feeling off. Its definitely gotten better but still a bit of a weird feeling. I still have these thoughts in the back of my head that are like “what if im in a dream”and it scares the shit out of me. I know im real but i still dont feel like it completely? Im absolutely terrified im like hallucinating everything and im just going insane. Everything just kind of feels like a dream? Im scared ive developed something and that this wont go away. I was told it shouldve been gone in a week or two but its been about a month and im worried.