Oh my dear itina, you must be terrified. I know I would be.
Quite frankly, I honestly can't see it having much of an impact on your h. Most MLCer's just can't seem to get their minds off their own "self interests", if their children are not coping, it is obviously because of something you are doing wrong. WE know this is not true. I think you should always keep your h INFORMED about his children, just don't expect much from him.
As for the boys, do you have an important, influential male in your life, ie. Father, brother, brother in law... cousin... friend? If not, perhaps you could get them a "big brother" or some such equivalent. Your sons need some help, big time. 15 year old young men, do cry easily, nor do they talk about life not being worth living. This sounds very serious to me. Perhaps the school could help you, they have in school counseling now, for these type of situations. They are very good as well. My middle son had a bad accident years ago and his big brother was with him, when it happened. My oldest son felt responsible. The school counseling, really helped.
I can't believe your S17's psych, told you to keep an eye on him, without providing you with some suggestions on how to help him. Yikes. You poor woman.
One of the things that WE ALL FOUND, our children very much took their CUES from us. When I was a whimpering, snotty, blob on the floor, my children were edgy, tearful and skittish. Once I got my feet under myself. Got my emotions under control and could talk to them confidently, they IMPROVED drastically. Our children depend on us. Not fair, I know, as we are in such a fragile state but sometimes having to get a grip and sort ourselves out, is the best thing for us. Having children that are obviously falling apart due to the situation, is often JUST THE STIMULUS we need, to get busy and start putting Humpty back together again.
Hugs Stayed