Mental illnesses are defined on a constillation of symptoms, symptoms that every single person displays to some minor degree. Depression can be defined as mild sadness at one level to people committing suicide at the profound level. Dissociation is similar, at a really basic mild level it is day dreaming, but for others it involves losing junks of time. Regardless of what it is called, the fact is you do dissociate and you do deserve to recieve proper support for that.
For me personally I do dissociate at an extreme level, I do loose junks of time and have absolutely no idea of what has gone on. My therapist has said that I dissocaite to the level of someone with DID, but that I do not go into other personalities. She also says that what I have is actually very common and in many ways is actually more disabling than DID because I do not have another personality taking over, I just go blank and hence I have wondered onto roads, turned the stove on, etc and had no idea it was happening. I have almost been run over way too many times, and have caused the stove to catch fire hundreds of times. I dissociate to the point that I do not even know the smoke alarm is going off, when I am fully awake!! What it is caused is really of no importance in helping me in day to day life. I do need a competent therapist, that I have so that I can deal with the underlying problems.
People rarely if ever meet a diagnositc crieteria 100%, they are diagnosed on what fits there symptoms best!! Any competent mental health professional, will treat the whole person and not just say you have this disorder and hence need XXX medicaiton, or XXX sessions of XXX therapy. People are not that simple, they are incredibly complex and need the whole of them supported, regardless of the name that may be given to their issues.