In our case, it was suggested by a counsellor that we might have MPD (called then but now DID) and I about went off on him. In MY world, that was not an option.
But I did have missing time, would have people talk to me saying they were taking classes with me (classes I had no memory of taking but saw later on my college transcript!) and a host of other things such as the handwriting differences and odd partial memories. Anyway, it was not until a year ago when I got my official DX that I could actually research DID and "accept" it was my truth.

The very best thing you can is have an expert work with you. Might not be easy and might take some time to build trust. But an expert is a life saver with these things. DID is not a true "illness" in a traditional sense of something being "wrong" with a person. DID is a "wellness" and a defense of the mind that allows mental and emotional survival for an individual. If you think you do have any of the DD symptoms, then working with an expert to find out the roots is going to be what allows you to heal properly from the past.