Not so provoked

Not being well known for biting my tongue, I'm struggling with not being provoked into anger at this point. I'm getting constant false accusations about actions I didn't do. I'm getting bombarded with questions as to why a task isn't done, when the time I spend explaining what I'm about to do is taking away from the time I could be using actually doing what I said I'll be doing.

The worst? "Why aren't you done with A?" "Well, you asked me to do B, C, D, E and F. So I did." "That's fine, but why aren't you done with A?" "Uh, because you told me to do B, C, D, E and F?"

I think I'm unable to deal with anyone else's obsessive behaviour, and this constant fixation with not having A done is causing everything to slip. It's getting to the point that, despite my attempts to not stress about this, their stress is spilling over into my life and seriously degrading my quality of life.

How the heck did this turn so bad so quickly? I feel myself complaining a lot now, and I really, really don't want to be that way.