Hello Mothership, a very warm welcome to you and thanks for posting your comment, which unfortunately is a sad one, and it takes a great effort to decide to make a comment, but pleased you have.
It's so easy when two people live together like you are, that as soon as one becomes dejected for any reason, then the other feels exactly the same, especially in a small country town as your resources seem to be limited.
It must be awful that your son has had cancer and recovering from it is not easy, not only for him but also for you, but wonder if his sexuality is a concern for you, as it shouldn't be these days as he's entitled to believe how he wants to be and probably no matter how hard you try, you won't be able to change how he thinks, the main worry is that he can overcome this cancer, and if he is able to, then that's positive.
Although I'm not a doctor, both anxiety and depression are related and one day one may be more dominant than the other, whereas the opposite may happen the next day, but it's something you can't predict and while you may have depression, he could be anxious, but it's trying to understand, why and how these two illnesses work.
If you can we'd love to hear back from you, when you feel as though you're able to.