I usually spend days alternating between satisfied, tired, focused, irritated and happy. When sadness or full-on anger or frustration enter the picture, I always feel like I'm being moody, even when my emotions are justified.
On almost every profile I've read on ESTJs, it says that we struggle with feelings of anger. I'd say that's true with me, only since I'm a female ESTJ, sometimes that anger manifests itself in almost crying/getting choked up out of frustration fairly often. It really pisses me off that I do that, even though I only do in front of family members or close friends.
Other times my anger is more... traditional... and it freaks people out. I tend to feel like I've unleashed a monster or something, even though when I get mad, I don't yell or throw things; I just fume. I feel really bad that this happens at all, even though it happens, at the most, once every two months.
Also (probably because of my inferior F), I unintentionally keep a lot of my negative feelings inside. (That's probably why I'm a generally cheerful and happy person.) However, when I'm around friends of mine who like to talk about their feelings or the feelings of others (specifically my ENTP friend), and I feel obligated to pitch in, those feelings resurface, and as a result I usually end up feeling terrible - sad, drained, etc. Sometimes when something bad happens, I get lost in my own head and brood on other past mistakes, most of them insignificant but for some reason still embarassing to me.
In a nutshell, I don't think that I am moody, exactly, or at least overly/abnormally so, but I often feel like I am.