Flat, flat, flat, fuzzy headed and tired...not sleeping...and I look wrecked and spotty. Day 15 (I think) and I ain't exactly bouncing. On a positive note, teeth and gums better, hands look better (strangely), nails look cleaner, smell better, not coughing, not wheezing, slightly more stamina.
So, overall, lots of little, very worthwhile improvements....but the initial bouncy euphoria has generally worn off, although it does come back occasionally. Still feel very committed.