Good for you Ames. You're right, keep the thoughts of days 1 and 2 in mind at all times, w/d's are actually your friend, in a way ... without that effect, you might never be able to stay quit off of opioids. Being totally depressed on day 4 is completely normal. If I were you, I would avoid taking meds to combat it ... pretty damn decent chance that nothing will work, aside from dope, anyways. You need to just let yourself heal for the time being, and just deal. Don't focus or dwell on the past, nor worry about things that may be in the future. Worry about the NOW. One foot in front of the other, try to focus on doing the next right thing and nothing more.
And if I were you, I'd seriously think about checking out some meetings at this point. Now is a GREAT time to start going to AA/NA or somethign of that nature. You won't be sorry you did, I promise you ...