Welcome! I'm glad you found us, but sorry you needed to.
I'm not an expert on Autism Spectrum Disorders (ASD); others will be along who have expertise in that area. I know they will give you a lot of great advice.
I do want to share what I know about the medications. Lamictal is helpful for mood regulation and emotional reactivity, but 50 mg is likely not going to do a whole lot. The first therapeutic level is 200 mg. You probably will need to go to that dose to see any benefit.
Are you seeing more aggression from Strattera? Strattera is effective in only about 40 percent of ADHD cases. Furthermore, common side effects are anger, irritability and aggression. I'd be concerned that it's not the right medication for an already aggressive child.
Have any atypical antipsychotics like Risperdal, Seroquel or Abilify been trialed?
Again, welcome.