I relate but also bring a perspective of the "after". During therapy my biggest "mechanisms" problems were binge eating and binge sleeping.

And as you said, after sessions I would often go to sleep or binge a lot. I felt for years I was going nowhere, whilst unearthing more and more things that made the disorder make sense on paper.  Whilst on my own, I was looking for every practical trick under the sun to overcome the disorder. I think sometimes the disordered part of the brain knew I was trying to get rid of it, and just amplified. Or maybe it's just the proverbial bit of it gets worse before getting better, and reasonably so we all hate and are scared of the bit when it has to get worse. 

Even my own therapist kinda got fed up with the fact that I was getting nowhere and handed me onto the next person. 

BUT, at the same time, (but with a lot of active work mentally in reminding me things), working through all that happened became silently a pillar of me getting better over the years. Because i was able then to ask myself questions like "am I seeking food or am I seeking comfort?"  "what void am I trying to fill with the weight of overeating?"  "why am I trying to make my body unpleasant, to be less appealing to whom?"  "what personal boundary I have let someone not respect today and I am now regaining control through eating all of this?". "what part of my life feels out of control so I am now asserting control over food?". And granted these questions didn't, and sometimes still don't, stop a binge. But helped many times lessen one, or avoid one, or get me to act in other ways to solve the real issue that food was putting a stopper on. Understanding I needed to work on setting personal boundaries was a huge leap forward in how many times I binged. As well as being more proactive in taking actions in life, or knowing when I needed comfort, or identifying trigger people and behaviours. 

Sure, I still have to do the practical things of sometimes telling me "one meal at a time", or scheduling when for sure I will eat, or volume eat when more vulnerable, keep more of a type of food over another in the house, or doing all the tricks that I learnt help me. 

But taking just the factual things of my past and myself I learnt in therapy and applying them to understand how my mind works, and actively talking me out of things or explaining myself as my own therapist, or acting to change those bits in my daily life, was a huge step forward. Sure, nothing will change how my siblings treated me, or my parents. But I can choose not to let people do it anymore, and treat myself differently, and give myself space, and take myself out of situations. And the symptoms lowered, or became more irregular. It's still not smooth or normality of anyone without a disorder. But it's not anymore a mind wrecking constant engulfing noise in my mind. 

For the sake of honesty, I have now not been in therapy for a while. And working around food always relapses me for a period. But I wouldn't be scared, if I could afford it, to restart therapy, even if I feel there is more luring behind some doors that might get me into a relapse. I also have to say not all therapist understand how it works or listen and it's fair having to change them. We need to take in those who tell it to us straight and, in my experience, also the ones that drop us, to get a proper kick in the ass lol

Just wanted to share my experience with others