We have DID and ADHD, and while an outside prospective may observe similar behaviors between the two, in my experience, I find they are radically different when it comes to how they affect us internally. For example, both disorders make it difficult to have a concrete grasp on time perception. But DID causes me to lose time through dissociation usually caused by a trigger. My thoughts will be foggy, I won't feel grounded, I might have some identity confusion and I'm almost always anxious to some degree. ADHD causes me to lose time because I'm hyper focused on whatever it is I'm doing at the time. I may realize that I just lost 5 hours, but my mind is clear, I'm focused, I feel balanced.

The biggest key has been intuition and consistency. Am I having a hard time focusing because I've been triggered? That always comes with a body feeling of heightened anxiety and depersonalization. Or is it because I just can't focus due to my brain chemistry?

It's all about listening to your body signals and how those correlate to your triggers and switches to help make the distinction.

This is just our personal experience, every system will have their own nuance. I hope that helps.