First off, congrats! You're doing something very brave and good for yourself.
Are you practicing ERP with a therapist? If not, you may want to consider finding one if possible. It can be difficult to start out on your own without professional guidance. The therapists on NOCD are very helpful.
That being said, I can give my advice based on my own ERP experience. Just keep in mind that I'm not a therapist.
My advice would be to focus more on the physical sensations without getting lost in the stories that the mind creates, and before trying to distract yourself. Distracting yourself may be a sneaky compulsion in this case.
What I mean by "stories" are the things like "I've accepted that nothing is real," and "I might feel like this forever." Those are nothing but thoughts, and they can also be responded to with "maybe, maybe not."
You say that you feel very "on edge." Okay, what does "on edge" feel like? Do your legs feel restless, like you have to tap your foot? Do your shoulders feel tight? Does your chest feel tight? What's your breathing like? How does your stomach feel?
As for the "fake" and "dreamy" feeling, you can simply acknowledge it. "I'm aware that things feel fake, dreamy, and distant right now." The brain tends to go into this somewhat "derealized" state when it's overwhelmed, so you can also just acknowledge, "I'm feeling overwhelmed."
As you do this, you will likely continue to get all of those intrusive thoughts in the background about how you're going to "feel like this forever," or how "this must mean that nothing is real," etc, etc. That's okay. All you have to do is acknowledge that those thoughts are there, and don't latch onto them. Those are all of the "maybe" thoughts. Just keep bringing your attention to what you know is happening in the present. You can even say, "I'm feeling anxious that this might last forever."
As you do this, just make note of your level of anxiety. Keep it simple, like a number from 1 to 10. Just be aware if that number is decreasing or increasing. If it's increasing, it likely means that you're doing some compulsion to try to get rid of the anxiety (like ruminating and getting lost in the thoughts). If it's decreasing, then just keep being aware until it decreases to a manageable level, at which point you can move on and distract yourself with something fun and rewarding.
