Hi Raisin,
I am truly sorry for what your son, you and your family have been through. You didn't mention whether or not your son is seeing a psychiatrist, psychologist or therapist. In my experience, a regular MD messed me up by prescribing an antidepressant that had bad side affects for me--I was so messed up from the drus (mind fog, loss of emotion) I didn't realize it. He didn't follow-up either. When I got another MD, I eventually was referred to a Psychiatrist. He realized right away that the med was getting toxic, got me off and on another. Psychiatrists are well trained to recognize the various mental disorders, and know how to watch for symptoms of side effects. Mine has helped me a great deal. There's a lot of work besides the meds, involved in getting well, for the patient, the family and the psychdoc (and therapist if one is involved.) A lot of work. I am getting tired of it and I know that's not good so I come here for advice and encouragement from time to time. I hope I've helped you at least a little. Don't give up the fight--you are your son's best advocate. You might try keeping a journal of his mood swings, what might have happened (or been eaten) to trigger the changes, how severe they were, what type they were and your and your son's observations of how he felt at various times of the day (and were the meds taken on time--critical). When I give this to my pdoc(psychiatrist) he is very appreciative--he says it really a help to him and takes notes from it.
This site is a great wealth of info and full of wonderful people who really care. I hope you have found a home here.
Wishing you and yours health and peace,
JourneyUpward