I just wanted to say good for you for taking charge of both your medical and mental health! I have worked in medical clinics with both active military and veterans, and this issue is way more common than you think. Many times, I’ve seen it be a combination of unideal medication regimens and psychology, so it’s great you are addressing both. The only other piece of advice I might offer is to bring in some couple therapy along with your individual sex therapy. As some others have said, post-traumatic stress symptoms are understandably difficult to deal with, and it’s essential that your wife can support you and also feel fulfilled in the relationship – this mutual support extends beyond just sex. It sounds like your overall relationship could benefit from working with a therapist together. Maybe she could come to some of your PTSD and/or sex therapy sessions if y'all haven't tried that before.