If you have become destabilized as a result of working with him, that is not a good thing. If he has somehow encouraged you to let down defenses that have previously kept these memories at bay, he should have prioritized providing you with the resources and coping skills you would need to deal with them first. It sounds more like he's been some sort of wrecking ball. Yeah, maybe tearing down your house gives you clarity to see the foundation, but now you're homeless. Not only that, but he has you convinced that he's the only builder in town that can help you rebuild.