Nemo,
Your inbox is full.
A couple of places you can try that can provide referrals:
If it's ptsd-primary dx, flashbacks/dissociation, can try the Sidran Institute's 'help desk', they have an extensive data-base, including recommendations for Ottawa area:
http://www.sidran.org/sub.cfm?sectionID=5
You could also try contacting Anxiety Disorders Association of Ontario:
http://www.anxietydisordersontario.ca/contact-us/
Mention it's OSI, service-related, maybe they can come up with an appropriate referral.
Internet research, can look for things like EMDR-certified; CBT certifications, etc. Even "neurofeedback" capable, etc.
Probably booked solid at Ottawa Anxiety and Trauma Clinic (Billings-- you might be familiar with the location). OSI/ROH probably has recruited the best of the best in their fields. . . and they're likely booked solid too, wrt to openings and/or long waitlists. You were probably given the contact of a person who is available, has space to take you in. . .