My PTSD was caused by a disabling injury from an industrial accident that "should have" killed me, and the lack of assistance from those who were responsible to get me medical help.

Well, to have PTSD you have to have experienced some type of trauma where you witnessed/feared death in a tragic way, and/or feared for your own life from a situation etc.

It is very common for people to repress events that are too painful to remember, but yet the body does remember and expresses it in symptomology.

I'd say go ahead and work on the symptoms, since PTSD is an anxiety disorder, working on anxiety (whether from PTSD or not) will help you live better.