The exact same story here. I dropped 10lbs the 1st week, and silly me, set myself up mentally to see that sort of number EVERY week

. Of course when week 2 came & only a single lb dropped, I was BEYOND inconsolable. Heck, I almost tossed my R-X bottle out the window!
But I decided to stick w/ it since I'd already paid the $$ & Walgreens wasn't about to take that bottle back less-4 pils, lol
I've just passed my 1-month mark on Phen, and in the 3 wks after that 1st high-loss week, dropped another 7lbs or so, but the weight DID flux (especially if you're a slave to the scale like I am

). I try to combat the dissapointment w/ a 'stubborn' scale by tracking my measurements instead, and by going on how my clothes fit & how I look. As for the scale, I'm weaning myself off of it, trying not to look until at least the week is over (hopefully I can eventually go a month w/o checking). I think in the beginning this is best; don't focus on what that scale sez, but what your body is DOING.
And don't beat yourself up for slipping; it happens. I had the same urge in my 2nd & 3rd wks. The only thing that keeps me from doing it is the thought that Phen isn't gonna be around forever for me, so I need to take advantage of it now as much as possible (the $$ spent each month is a deterrant too, lol)
Hope this helps, and CONGRATS on the loss so far, you're on the right track! I know you'll keep it up.