Did the itching start after the Vyvanse? Sometimes there are rare side effects.
The rest of what you describe fits sensory processing disorder (VERY common with ADHD):
And SPD related behaviors can often look like anxiety or SPD can cause anxiety.
Since your child’s medication and symptom profile is turning out to be more complex (which is also common with ADHD), it is a good idea to see a specialist. Could be a pediatric psych, a neurologist, or a developmental doc. It’s most important that they have lots of experience with ADHD, not what type of doctor they are.
ADDitude Community Moderator, Author & Trainer on Parenting ADHD, Mom to teen w/ ADHD, LDs, and autism