Hi Gem,
So after reading your post, and being 28 suffering with depression myself I have to say hats off to you, it may not feel like it but you are doing an amazing job!
The fact that your boy at least started to seek help is a slight acceptance from his part that he needs help, its an extremely intimidating thing to have to do on your own and so complex. when I first went for counselling it took about 3 months of talking about things I thought were wrong, before I actually started to get to the core things that affected me.
one thing ive learnt over the years from helping people is that you cannot help someone who does not want to be helped, that doesn't mean you should stop trying, just that you should be aware that what you are doing is right for him... its just going to take time for him to decide his had enough of feeling how he does and make positive changes to get better! sometimes a lil push is all we need, i hope he realises how lucky he is to have a mother who supports him the way you are!
Its great that his company are working with you regarding his depression and placing him somewhere he feels more comfortable, i hope it does him some good!