You're on the part of the roller coaster that occasionally lunges into a curve or zooms through an unexpected bounce. But it sounds like you've moved past the bottemless drops. You have a better handle on those and so they diminish. As you continue with your coping skills the rest of the swishes and sways will continue to fade, so hang in there.
Your WH is not the only victim of PSTD. If that is part of his problem, it has become part of your problem. It is not a singular wound for him alone to proclaim. As for him serving his country, don't ever let him think you didn't hold up your end or support him every step of the way. That is more than any OW can come in a claim.
Not only are you within your rights to explore every option, and understand every fact regarding settlement options, we would be sad if you didn't. GAL includes taking control of all things that affect your current situation or future outcomes. If he is in a big hurry to make a deal, he should get in line for a game show.
But you asked for suggestions. So I would say that when you meet the military folks on Friday, get a sense of whether they seem biased in defense of WH or not. If they seem open and honest as they should be, see if they think you should be talking to a L or would recommend one with experience in fair settlements of military benefits.
If they seem defensive or biased on behalf of a veteran, then just take good notes on all they have to say, names and numbers included, then thank them for all their help ... on your way out to locate a L.
If you do find yourself interviewing Ls for free, ask about their experience working with military benefit settlements. You don't need to be teaching a L new tricks on your dime. You've been through enough and still have a better life to be lived. You need someone to help keep things simple and handle all of WH's concerns ... right after your own.
Take care, enjoy your family, and keep living your best life.