I don't know how old you are, or how long you've been on Concerta. But to provide a different experience to anyone reading this:

I too got (re)diagnosed in my 30s and prescribed Concerta. Rediagnosed because my mom then told me I'd been diagnosed as a child and she just never told me. Finding the right dose took some trial and error, and to be honest "the right dose" is something that will probably vary throughout my life based on how good my non-medication ADHD management is going. But for me it's been life-changing without burning me out, and it's been almost 7 years.

I also think even without the medication the diagnosis is worth it. It clarifies your life somewhat, if there are things you have struggled with that it explains.