How to give tough love in a constructive way?

My husband is a marine and has been for 6 years. Recently while on duty he hurt his knee. After several MRIs and speaking with specialist, they told us it will permanently be damaged, but that he can strengthen if through physical therapy and knee injections. If that doesn’t help he will be medically separated (after 6-8 months). When he first got the news, my husband was devastated. He loves play sports and a lot of his identity and hobbies are tied to using that knee (being a marine, physically fit, hiking, hunting, etc). I thought that that, plus the thought of being separate (essentially losing his job) would motivate him to do what he needs to do. But it hasn’t. It’s almost done the opposite. He still hasn’t gone to Physical therapy (after two weeks) and has stopped working out because it hurts. He is perfectly capable of at least walking a little or doing some weight lifting, he just isn’t supposed to run yet. He also is supposed to be seeing a counselor who can help support him during this time and after seeing him twice has refused to call him because he thinks that the counselor should have to call him and schedule with him if “he really care about me as a person”. So basically he has given up. At first I knew it was hard on him and I tried to be supportive and let him know I’d be right there and I kind of let him do his thing for a few days to give him space to cope but now I’m scared. If it really concerned him to not be able to use his knee, why isn’t he pushing himself to go to PT? Isn’t he scared to lose his job/our home, etc? (I work as well, so I could support us, but he used to take so much pride in being a marine). He wants me to baby him 24/7 and has even started using it as an excuse to get out of things (can’t go on a family walk because it hurts, etc). How do I give him some tough love in a way that motivates him and not a way that discourages him more? How can I wake him up a little?