OK, so what is stopping you from having had these issues resolved individually before now?
Why are they bottled up?
We all have issues with our P's, I thought you were me for a moment... 
If incidents happened a long time ago, you know in your heart of hearts, that you can't cite them now. You have to let them go.. (I'm a fine one here talking!)
It could be that the initial incident was not dealt with and similar incidents come alone later and tread on already inflamed areas, validating the anger over the first incident in a disproportionate manner.
Try to take a step back, put your devil's advocate hat on and sort your issues into themes.
Write them down and see how many are new issues and how many of them are variations on the same thing. I'm willing to bet that once you have put all the incidents in to 'piles' of similar issues, like sorting socks, there will be a few individual issues, and a number of piles each representing an individual issue.
Then your task is more manageable, less overwhelming. Tackle each 'pile of socks' slowly and gently with P. Don't forget he probably has no idea of the simmering resentment you worked yourself up to, and if you go in too hard, he'll shut down and it;ll be a massive banging of heads. Highly unproductive.
If you save up all bad things that ever happen, it will colour your everyday. Sit down and list the things you enjoy about your relationship. the benefits of it, what makes you smile.
Be honest with yourself!
Good luck