Hello - I hope no-one minds if i join you all. I am in quite a different situation to most of you in that i am separated and share custody of my two wonderful DC (DD who'll be 5 in a couple of months and DS who's not long turned 2) on a 50/50 basis with my stbxh.
I have always been the more strict parent and since we separated (over a year now), i found myself shouting all the time which is just horribly unfair. My DC trying to cope with their new reality really don't need a shouty mum. Like a lot of you, i probably took out my hurt and pain on my DC (DD in particular) by overreacting to annoying but 'small in the big scheme of things' stuff.
This has calmed down A LOT and i have tried so hard to bring in new ways of dealing with DDs behaviour - this thread is ace!! - but i will admit, that probably about once or twice a week - i shout 
Following your counting rule - I am currently at 0, with no chance to rectify until they come home next Sunday 
My triggers - like so many of you - are being ignored, mealtimes and the way DD treats DS like a toy.
They are incredibly affectionate with each other so i have no worries about aggression (and do know how lucky i am), but she just yanks him around without a second thought. Having said that, she rarely hurts him and DS doesn't seem to mind so perhaps i should just leave them to it but that just feels.wrong... god, i am controlling 
Stbxh has become so nasty since he left and makes me question everything i do and i find myself analyzing every day and coming up short!
The kind of parent i want to be: calm, fun, empathetic, supportive and someone that both my DC can rely on and be proud of as they grow..
I feel almost physical pain when i think about how much i am getting it wrong at times and i know i do get it right sometimes (was probably at 6 until today), but when its bad, its bad!
Sorry for the Me post, but this seems like such a welcoming and supportive thread, i hope you don't mind
Oh, and a very smart woman once told me that the torrent of chat & information that comes spewing out at bedtime is because that is the time that their brain has finally slowed down enough to remember it all. Because of this, i now spend at least 10 minutes after story time and with a night light on, just having a chat with DD. Bedtime was definitely one of my triggers but now she gets the chance to talk & doesn't think see me trying to get away for some down time - its much better. Not saying you don't do this Nellie and is probably harder with your two sharing a room, but i was at the end of my tether with bedtime too.
Hugs and
to us all (and Happy Mothers Day!)