One stupid week, how long does it take to feel normal?

Well I'm an idiot and now suffering the consequences from just over a week of taking "Sleep Walkers" from the gas station. The bottle says take two at once, and no more than four in a 24 hour period.

My dosing schedule (per day) went 1->2->3->4->5->4->3->2->Off

Fortunately I knew to get off the ride because the day that I took a total of five had horrible side effects, and I barely slept because I kept having nightmares and I couldn't return to sleep after.

I took the last two just over 36 hours ago. Last night (about 12 hours without) I started feeling a little melancholy after I got home and just sorta moped about. Tonight I feel something akin to depression (when I went through that). Lots of hopelessness for the future, etc. All the nasty thoughts about every little bad thing in my life. I am able to rationalize it fairly well, because I know it will wear off. Appetite has been extremely poor.

I'm just curious if anyone else who has gone through a similar one week binge has experience with when I can expect to turn a corner, or if I can anticipate it getting worse. I know that long-term users have withdrawals that can last weeks after jumping off, so I'm hoping I can start being on the upswing soon after taking it for just over a week.