Cannabidiol is a natural component of cannabis without psychotomimetic or addictive properties. Cannabidiol has been shown to produce therapeutic effects including anticonvulsive, anxiolytic, antipsychotic and neuroprotective effects. The investigators hypothesize that treatment with cannabidiol will result in improvement of depressive and anxiety symptoms, as well as, improvement in functioning and inflammatory biomarkers. During the clinical trial subjects will receive study medications (cannabidiol 600mg/day or placebo) for a period of 12 weeks.