That could actually be from something in the multi-vitamin. MTHFR polymorphisms can cause some to have mood issues when taking folic acid, because the process to break it down into a useable form in the body is somewhat broken.
For omegas to have any impact on focus and such, the dose needs to be pretty high.
Penny
ADDitude Community Moderator, Parenting ADHD Trainer & Author, Mom to teen w/ ADHD, LDs, and autism