B..
Hang in there, Mom. If he is seeing a psychologist, then that's the mental health professional and they ought to tell you ways to help him. Sometimes it's a slow process. If its depression, figure several months. If its deeper, even more.
We all have our struggles and when we have kids, their struggles affect us greatly. It sounds like you are very tuned in to him, as you should be, so for his sake and yours, concentrate on building your family. That will be of most help to your son and you. You can't make your whole life and your family's life, be contingent on this one's mood.
Invest in fun things. Spend time with him and the family in low cost ways, everyday. Let the housekeeping go, play a game, make supper a picnic, turn off the TV and computer. A strong family life can be the link to healing he needs. It will go a long way to help everyone in the family to maintain their own level of sanity. A pet could be a good thing for this. Remember, most of the care will fall to the adults. Sometimes it's worth the work to provide that unconditional love that a great pet can provide. Feeding and careing for it can give him a sense of competence.
I know of several kids who had childhood mental health problems that turned around in time and they are very successful human beings. Maybe look for a support group in your area. I've belonged to a prayer group for years that gives me hope and feedback. Look for support everywhere.
May God light the Way.