UK M22 does diagnosis do anything?

Does getting a diagnosis do anything good?

Or is it like just getting a label to attach yourself to?

I got advised by my psychiatrist like 6 months ago to get an autism assessment form to be filled out when I got diagnosed with ADHD, but i've procrastinated on it and not done it.

With ADHD there are medication treatments and stuff is there similiar stuff to autism.

Thanks in advance for an advice or help.