DID and energy
There is a lot of energy that is taken up in dissociative disorders when there are separate parts, ego states, alters, etc.
This is because mental energy is needed to keep up the amnesic barriers between parts, between awareness and between conflicting emotional states.
In addition, it takes a lot of work to do internal work, to try to communicate with parts, to try to facilitate sharing of ideas, feelings, memories, etc.
So, instead of beating yourself up for how much effort and energy it takes you just to get through the day, try thinking about how amazing it is that you accomplish all that you do, given how much of your daily emotional, mental and physical energy is taken up in dissociation.
You are actually a rock star!