I have PTSD and I used to have OCD in addition to the PTSD. OCD was just one way I tried to manage my PTSD anxiety symptoms.
It's my understanding you don't want to go to therapy because they did not have information about the OCD, is that right? In my opinion, you have absolutely nothing to lose by trying out the free therapy. Dealing with someone with OCD and PTSD is very tough. If they handle PTSD a lot, I am sure they have seen people with OCD that is fueled by PTSD.
The standard treatment for OCD is Cognitive Behavioral and Exposure therapy - these two forms of therapy are among the most effective therapies for PTSD as well.
I understand your concern that if the OCD is gone, he won't be able to handle his stress. That is a very valid concern. That is why getting treatment for the PTSD is crucial. In fact, let's assume they know nothing about how to treat OCD, but they do treat the PTSD. Chances are, as the PTSD anxiety is reduced, the OCD will be dramatically reduced as well without him even working on anything else other than the PTSD. Learning how to manage anxiety and emotions in healthy (and non-OCD) ways is a core piece of PTSD treatment.
At the same time, reducing OCD behaviors doesn’t usually lead to an increase in anxiety over the long haul. One of the hard to understand things about OCD is that while it is anxiety-based and anxiety-fueled, OCD doesn’t actually reduce anxiety. At all. It’s one of the key things about OCD. People do the OCD type behavior and they don’t actually feel better after doing it, but still feel compelled to do the OCD behavior anyhow. That’s the compulsive (C) part of OCD. People still do the OCD behavior even when it doesn’t make them feel better. OCD is a way that anxiety is coped with and expressed, but it doesn’t reduce anxiety. So when it goes away, it doesn’t always mean the anxiety gets worse.
With PTSD, anxiety often does get worse before it gets better, and this could be a huge factor in things.
If he is seeing a trauma therapist already, and you do not feel like they are sufficiently treating the OCD, you could talk to your husband about talking to the therapist and getting additional support or getting a second opinion.
I'm not a big medication supporter, but there are also a couple of medications that can be pretty helpful for some people with OCD too.
It might help you get into more support networks if you call it "OCD" instead of "combat OCD" or say he has "OCD and PTSD." OCD can be a disorder that just happens with no link to trauma. There are also many people with OCD who develop it after/in relationship to trauma and trying to manage the stress of trauma. There are actually a lot of studies done on people with OCD and PTSD together, because there are a lot of people who have it together.
In fact, studies have shown that people with OCD and PTSD together tend to get better more often than people with OCD alone. The techniques that work to help reduce OCD in general do work for OCD that is co-morbid with PTSD. They won’t work as well if the PTSD is not also being addressed, but they can still significantly help.
In the end, your husband is the one who has to do the work to change, and even with the best therapies and highest level of motivation, it is going to take time for him to change. The best way you can support him over the long haul is to get support for yourself.