Center for Anxiety and Behavior Change is an amazing practice for this! Our therapist is on medical leave or else I would recommend her

I am so sorry you and your child are going through this.
I recommend Brandon Lopez: https://www.psychologytoday.com/us/therapists/brandon-lopez-chevy-chase-md/1654211.

He has helped my son tremendously with his anxiety.

I would try Capital Youth Services in Bethesda.

I have a kid whose significant physical health issues impact their mental health issues so I am sympathetic to the complexity of the situation you are dealing with.

Just seeing if anyone has a great therapist (cognitive-behavioral approach) for a middle schooler with anxiety when has to recall information for tests in classroom. He has a brain tumor with ongoing cognitive issues and increasing anxiety as he becomes more aware of everything. Anyone in/close to Chevy Chase ideal.

Thank you