My employer gave me the help of a coach last autumn for a few weeks. She helped me mostly with my anxiety which was the most problematic for me at work. Now if the Concerta can kick in, to smooth out the rest of my quirks at the office 
As for a support group to go to, I’d love that very much but I can’t find one in my region at the moment. But with ADHD gaining in momentum (hey there’s a bunch of us out there and we make our needs known lol) I’m confident to eventually find one. If you didn’t already, you can go through the info about coaching on the blog section of this site.
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