Doesn't sound like DID, best way to determine is to be professionally evaluated by a psychiatrist.
What you describe here, can be several things, first one that comes to mind is, Borderline Personality Disorder.
There is a good website for this called, BPD.recovery.com, google this disorder and you'll find more good websites that may be helpful to you.
Best though is to see a mental health professional for evaluation, rather than wondering what it is that you have.
"Wondering" just creates more anxiety.

Take care,
DE