Strattera question

I've been on Strattera for about three weeks now, and it's been going very well.  Extremely well, actually.  I'm planning on upping my dosage slightly when I meet with my doctor in a week (I'm currently just taking 25mg once a day).  However, one thing confuses me... I thought Strattera was supposed to be like Prozac in that it builds up in your system, and one dose doesn't have a major effect in and of itself; it's the levels of it staying high in your system.  I'm confused because I forgot my dose this morning -- and I've been my scatterbrained old self all day.  I thought I could go home this afternoon and take the dose and be fine, which I still plan to do, but I didn't think I'd see such a recurrence of ADHD just from missing my morning dose.  I haven't been able to accomplish a damn thing this morning.  Maybe I'm just convincing myself of this?

Forgive me if I seem overly worried about this... I just have such huge hopes for Strattera that any problems with it get me really concerned.

My understanding is that Strattera actually stays in your system for like 5 hours but the effects of it remain for 24.  I'm not sure why it takes a few weeks to feel the "full" effects but after 24 hours it is out of your system.  I'm not surprised you felt your symptoms coming back after missing a pill. 

I was on it for 5 weeks but had some nasty side effects.  I stopped taking it after 5 weeks and within 2 days I had no effects from the Strattera at all.