I often have this fear of revealing too much and explaining particular things in too much detail. So I tend to either avoid certain uncomfortable topics at all cost, or I'll briefly mention them, and then declare that I don't wish to discuss the issue in any more detail (when T decides she wants to know more about it). *looks down shamefully* I've no doubt that this is sabotaging my progress in many respects.
Realistically, I'm not sure that there is actually such a thing as TOO much information when therapy is concerned, and if there was, I'm almost certain your T would tell you! Being completely open and honest about everything is brilliant and completely admirable, in my opinion anyway!