Being a shrink, I have worked with tons of PTSD patients, from abused little girls to tortured Viet Nam vets. The diagnosis gets made too frequently to anybody who has had a "traumatic experience" in life. But who hasn't? True PTSD, if you have it, causes a complete neuro-endocrine dysfunction, with severe symptoms of nightmares, flashbacks, abnormal fluctuations in temperature and pulse, hypervigilance (a paranoid sense something bad is going to happen and you need to always be "on guard"), anxiety, depression, and more.
The physiological states associated with it include hypercortisolism with excessive adrenalin, leading in time to adrenal burnout, low thyroid, low testosterone and sometimes low GH. If you've got all this, you sure are going to have a hard time putting on pure mass. PTSD is far more than a "subconscious thing", its a dysregulation of mental and physical systems. It can be helped dramatically with various forms of therapy (EMDR, tapping, group therapy for vets) and some meds (beta blockers, GABA drugs, Zoloft).
Now, HRT interestingly, if done right (read KSman posts), can actually reverse many of these physiological effects without all the shrink work. At almost 51 I am making very nice gains every month and the more I train, the more conditioning I recover, and then the harder I can train. The intensity is what really drives the progress. Looking back, I didn't train with true intensity for the past 15 years, and just kind of floated along, sort of being a quasi-strong guy.
Find the love of training you once had...that will do wonders. And Uber N3wb is RIGHT-train the squats and deadlifts hard-I had totally bought the bullshit that my doctor friends all preach..."You're too old for those and they'll ruin your joints." Hah! They are HELPING my joint problems, the strength gains in my lumbar erectors have DECREASED the pain I have from bad discs. Doc