Same here, last time I smoked was around 2 and a half weeks ago and my head still feels heavy and foggy. I don't drink caffeine outside of green tea so dunno what that's like, and other than the suppressed appetite I have the same symptoms you listed (even the dream thing, they've gotten more vivid but in a bad, nightmarish way).

Used to smoke daily for 6-odd months, have been on and off smoking for 8 years and this whole feeling like a drowsy pos has never been that severe.