wanted to add since I know you like to look up / research mental disorders the first two in my post ( Reactive Attachment Disorder, and Disinhibited Social Engagement Disorder) are diagnosed in in children between the ages of 9 months and 18 that in non professional terms have PTSD and problems with social situations / mood problems) so unless you are not an adult you would not get these diagnosis.

Adjustment Disorders means a person has stress related problems that are short term (not lasting) non psychotic (no halucinations, no delusions, no loss of contact with reality, no disorganized speech or behaviors) and their stress causes them to become extremely suicidal, possibly needing hospitalization.

post traumatic stress disorder is having long term problems with nightmares flashbacks, anxiety intrusive thoughts, depression emotional distress (trouble sleeping, irritability anger......) as a result of direct exposure to trauma, witnessing a traumatic situation or indirectly exposed to something traumatic by learning a relative or close friend was exposed to trauma (example my fears for a friend who was abused can cause me to have nightmares, anxiety, depression.....) or indirect exposure by being a police man, fireman or in the military or other public service worker that has to deal with trauma and traumatic situations. having these symptoms affects all areas of a persons life. the problems can not be because of drugs or alcohol legal or otherwise. PTSD can be alone or with dissociative specifiers depersonalization or derealization. (these are the same that you see in my dissociation links)
Other Specified Trauma- and Stressor-Related Disorder means you have PTSD like problems but do not fit the PTSD diagnosis. a treatment provider tells you what mental disorder you have that is causing you to have PTSD like problems. example a person with depression may have depression due to trauma but they dont fit PTSD because they dont have anxiety, flashbacks, nightmares and all the other requirements for PTSD. in other words a treatment provider can decide a persons mental disorder symptoms fit better in the PTSD category.

Unspecified is for emergency use where in the er this is diagnosed then when they see the regular treatment provider the treatment provider changes the diagnosis to either one of the trauma and stress related disorders or another mental disorder that that the person does have. the unspecified labeling is also used when a treatment provider does not want to tell a person why they do not have PTSD example someone goes in to their treatment provider and says I have PTSD and they firmly believe they have this. but upon assessment it turns out they do not have this disorder. treatment providers have to assess whether its in the clients best interest to treat as if they have this category of problem (most times this is ok due to many treatment options for mental disorders are the same... therapy, medication and address what ever issues the client bring up or has a problem with, so for example if a person is claiming to have a dissociative disorder but they actually have bipolar disorder the treatment is the same... medication for depression (which does have dissociation problems) anxiety, manic\psychotic symptoms and therapy sessions) with unspecified the treatment provider does not have to answer any questions as to things like why the person doesnt fit the disorder they are looking for.