I greened out and still dont feel good, help

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 “what if im not real” and it scares the shit out of me and ill believe im not real. 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.