Hi, very worried about my 27 year old son in military. Diagnosed with PTSD along with a back injury. He doesn t sleep good t night. He s on Xanax, Valium, blood pressure meds, cholesterol meds, muscle relaxers and I m not sure what else. He was in ER again tonight and got more Vicodin. He drives a motorcycle and his auto. He seems stoned on these meds. How concerned should I be with the interactions of these medications?