Here is a selection of links and research articles on ketamine and lidocaine for depression, PTSD, pain, and other conditions. The articles here represent a portion of the information available, and are meant to supplement your own research and discussions with your referring physician.
Duman and Aghajanian
Synaptic Dysfunction in Depression: Potential Therapeutic Targets
Tajerian et al.
Differential Efficacy of Ketamine in the Acute versus Chronic Stages of Complex Regional Pain Syndrome in Mice (Full text requires login).