Any Single Mum's with young boy's with ADHD?

My 9 year old boy has recently been diagnosed with ADHD.
My ex is not interested in meds..he believes that Our Son needs to exercise more..and add more activities out of school.
My heart breaks for my boy..He has learning issues and performance is low. This has affected his self confidence and does not want to go to school...
I could go on and on..
I feel like shit most of the time because he is struggling.
We have an appointment with a Behavior Specialists in a few weeks.
Hopefully she can set me in the right direction.