Hi Lisa,
What you describe sounds like depression to me and you are not crazy. You are being attuned and concerned about your son. I was deeply depressed when I was a teenager and attempted suicide. However, I never received counseling afterwards and it wasn't talked about in our family. It would have been a relief to be able to have an enviornment where I could talk. I would suggest talking with his counselor about your concerns and come up with options. Whatever you do, do not ignore or let this go...it could be quite serious.
The following are two links of a part one and two regarding major depression. They also have links to other sites that maybe helpful. Also, in children and teens depression often manifests as anger, so please be aware of this. Good luck to you and your family.
http://gosmelltheflowers.com/archives/7785 and
http://gosmelltheflowers.com/archives/7789