I was diagnosed with ASD early this year, though several years of research of various mental health conditions had already led me to believe I have Aspergers - difficulty with socialising, literal understanding, inability to lie, inability to be diplomatic, etc. It was then a case of convincing my GP, psychiatrist and psychologist to perform the relevant tests.
(Annoyingly, It seems that some psychologists in the UK refer to the DSM-V, in which Aspergers is lumped in with ASD, rather than the ICD-10, which still includes it as a diagnosis.)
During the course of all my reading I came across the assertion, by several specialists, that, due to the huge effort required for even simple day to day living and the constant anxiety and depression that causes, PTSD may actually be a very common comorbidity from an early age.
This being the case, then any further trauma, such as isolation, relationship breakups - events that many neurotypicals might cope with relatively well, can hit people with ASD's much harder.. let alone truly traumatic situations such as abuse.
I've never come across information specific to treating a combination of AS and PTSD, though I have recently begun a course of psychotherapy with a very understanding psychologist, who has experience with both conditions, and has been able to help me clarify and deal with my own issues.
Treatment may literally be down to approaching different therapists until we find one who is sympathetic.