Powerful. I also become paralyzed with this phenomenon. For me - to embark on a task often means, one of two options - failure, punishment, shame, insult, devestation that it's never going to be good enough (That I'm never going to be good enough)
OR "success," and a feeling of having been suckered, controlled, used, laughed at, tricked...
This is how it is for me on a bad day - these demons stop me from doing anything, and I sit, resentfully, figuring out how to do absolutley nothing - which can be a challenge in itself.
At other times - my self esteem is sufficiently fed that I can push these feelings away and talk myself into doing things. Even then - it's like a huge mental drama to get myself going, and the smallest criticism or setback can and will stop me in my tracks.
Then - to get something done, in a healthy way, without a bunch of crappy baggage feels like this huge victory for me - that nobody around me seems to appreciate, and my happy dance is not shared with anyone -I'm thinking I have to learn to be OK with the loner happy dance - that is where the progress might occur for me...