Is the psychiatrist responsive to your input? IMO, it would be reasonable to try a different SSRI before adding a second medication to one that might be causing mood lability. It's not unusual at all to have to monkey around with medication--many people have to try different antidepressants before finding one that helps without causing intolerable side effects. I'd be careful and ask for the rationale. Monotherapy is preferable, when possible.
Does your DS take other medication (e.g. stimulant, etc.)? DS here had a really rough year last year with medication for ADHD and my opinion is it was changing body chemistry because of hormonal changes.
Sorry things aren't going well. We had to discontinue SSRI for DS. It wasn't causing the same problems you're describing but was problematic nonetheless. I explained to the psychiatrist we couldn't afford to experiment like this right now, and he was okay with it.
If you aren't comfortable with the physician's approach, do you have other options?
