Ugh, I'm sorry the results came as a surprise to you. That is never fun. I've talked about our ds3 and our struggles with him here for years. Still the ADHD and anxiety diagnosis were a surprise. He does have moments of aggression too, at school and at home, but they come and go. This spring we would see an episode every other day for 3 weeks. Then nothing for months. Or even years. It's hard walking on egg shells.
Dont be afraid of the medications. When people outside our family ask me if I've tried other solutions ( I've heard every suggestions under the sun), I just point out that 1- would you ask a nearsighted person to try other solutions before getting them glasses? And 2- studies are starting to show that a large percentage of children who don't receive the tools they need to cope with ADHD as children, turn to self-medicating (drugs and alcohol) when they are older to cope with their racing brain. It's worth trying the medications now.
After 6 months of trying different meds and with the wise counsel of the mamas here, we have settled on Concerta as the ADHD med that helped ds3 best with the fewest side effects. A couple of the meds we tried caused some serious emotional outbursts (vyvanse and focalin) but Concerta didn't cause the awful outbursts. It does cause low appetite and OCD or exasperates what he already has (I think we have some OCD in the family), and it causes him anxiety so we put him on Prozac. It had worked for members of our family in the past and is working very, very well for him. It takes a lot for him to have an outburst now.
We also started behavioral therapy which has been very helpful for him and our family.
Dont get discouraged! Getting our diagnoses was hard to swallow at first but has been fantastic for our DS3 as well as our entire family. We have been able to enjoy activities that we couldn't for the last 8 years because it would be too hard for him. And he is excited to try them!
I agree with holding off on the Zoloft until you have the ADHD med sorted out. See how he does with the ADHD medication before trying an antidepressant. Zoloft wasn't the best choice for our DS3. His aunt had a difficult time with that medication. But she had great success with Prozac and so did MIL. Apparently because of family brain similarities, some antidepressants can have similar effects on family members. Just something to keep in mind when considering the antidepressant.