Everyone is different; scents, music, words, touch, observing the surroundings, listing the colors they see, focusing on breathing, holding a familiar object (like a rock), etc. can all be used -- whatever works.
You can use drugs to help with the symptoms, but you can't "fix" it with drugs. There's nothing physically wrong with a DID patient (although they do tend to suffer from various "side effects" that are linked with the disorder).
As far as how it works physically, we don't know for sure. Yes, the memories are stored and can later be accessed. Part of the problem is that these memories are stored without being processed or are "stored" with a part that is unable to make sense of what happened. So instead of dealing with what happened the patient relives the trauma over and over again. What's interesting is that one part can "share" a memory with another part. When this happens it's like "remembering" something you've never experienced.
You can use drugs to help with the symptoms, but you can't "fix" it with drugs. There's nothing physically wrong with a DID patient (although they do tend to suffer from various "side effects" that are linked with the disorder).
As far as how it works physically, we don't know for sure. Yes, the memories are stored and can later be accessed. Part of the problem is that these memories are stored without being processed or are "stored" with a part that is unable to make sense of what happened. So instead of dealing with what happened the patient relives the trauma over and over again. What's interesting is that one part can "share" a memory with another part. When this happens it's like "remembering" something you've never experienced.