I have PTSD and neurocardiogenic syncope. The latter was diagnosed via a cardiologist with a tilt table test. Basically there is a miscommunication between my brain and my heart that causes my blood pressure and heartrate to plummet, resulting in me losing consciousness. It is exacerbated by anxiety-producing situations, such as PTSD triggers. Interestingly, the same drugs that have been used to lessen PTSD symptoms are also used to treat neurocardiogenic syncope (beta blockers).

P.S. I think some people are confusing the term trauma with the symptom of interference of normal life activities (school, work, relationships, hygiene, etc.)