I don't mean to be overly wary but I'm noticed that a poster comes on every so often with a "testimonial" to plug for the Guelph MMTR clinic (usually he or she has a minimal history on NT). I would like to see some clear evidence that whatever they have on offer works (frankly, after checking out their website, I'm skeptical).

Frogrdoo, two of the best concussion specialists (medical doctors) in Toronto are Dr. Charles Tator and Dr. Karen Johnston. Both are highly reputable. Checking in with one of them might be a good starting point, although I'm not sure they will recommend much more than the standard treatment of physical and cognitive rest. There is an osteopath in Dr. Johnston's clinic named Tanya Dei Tigli whom you could consult. She has a particular interest/background in treating concussion patients.