Hi Harry,

Welcome to the NeuroTalk Support Groups!

Well, lots of different forums for you to investigate.

ADHD, OCD, TS, Depression and others can be comorbid conditions. Some people have ADHD, OCD, Tics, Depression and Autism. Not everyone who has Tourette's Syndrome for example has ADHD or Depression though. Some people actually do "just" have tics. There is quite a common overlap between OCD and TS although it's often important to differentiate if treatment is considered.

e.g.
http://neurotalk.psychcentral.com/post499452-2.html
Challenging Phenomenology in Tourette Syndrome and
Obsessive–Compulsive Disorder: The Benefits of Reductionism

On the subject of Tourette's Syndrome. Do you have tics?

List of Common Tics - L. Packer from TS Plus
http://www.tourettesyndrome.net/wp-c...CommonTics.pdf

We have RLS, ADHD, OCD, TS, Autoimmune Forums.

Because they're all separate forums, you may want to have a look down the list here.
http://neurotalk.psychcentral.com/index.php

Unfortunately we do not have a Left Handedness Forum.

Regarding intrusive thoughts...

Have you read "The Imp of the Mind" by Lee Baer?
There are lots of good links in the Sticky posts at the top of the OCD forum if you're interested. Also in the others as well.

You may also be interested in PANDAS, PITANDS, and PANS and the immune system connection research.

You may also be interested in the "ferritin" or iron storage connection with RLS, TS, ADHD and more.

You can do a forum search for any of these terms in specific forums btw.
http://neurotalk.psychcentral.com/search.php

Good luck with your investigations.
I'm sure we'll talk again.