I believe the controlling is a symptom of anxiety. My stepmother was extremely controlling and "taught" it to me through her actions/abuse (I had my own anxiety issues). Hopefully you have a therapist who doesn't get into will struggles with you. I was in therapy with the same therapist twice, for 9 years each with 9 years in-between (so roughly 30 years). I did learn to tell when I was controlling and let go some and be vulnerable, etc. but I can still be anxious and still be controlling; that will be with me always but I am more aware and can choose other ways now where it was too automatic before.

Therapy helped me break the automatic knee-jerk reactions, made me aware of what I am doing, when, so I can choose. It did not make what happened to me go away or be as if it did not happen or make it "okay", etc. It just helped me put the actual experience into my past, as part of my life and who I have become and helped me distinguish what is going on "now" from what happened then so I do not respond to now as if it were then, I have more space around me and the ability to choose, which is very nice and more comfortable.

Remember, it takes time. You had 4-5 years worth of intense, daily "training" and learned well; it won't get fixed in just a year or two worth of weekly therapy. You have to look for ways to practice who you want to be in the circumstances where it makes you uncomfortable; you have to deliberately let others go through the paper and edit it, realize that what you "learn" and who you are is not dependent on how well others do their job (even if you were to get a "B" because another did a sloppy editing job, you know what you know and are doing your own thing, not whatever someone else has asked of you or determined you "should" be doing). Practice looking beyond the immediate task to other possibilities. You need to learn you do not have to be the "best"/only, that having time off to work on something you enjoy more is worth not working so hard on this other task over here where you might get an okay, not great result, etc. Not only is there a lot we cannot control, there is even more we don't want/need to control! But you have to practice letting go, it won't come naturally to you.