Squirrel, I took a look at the link you posted. The withdraw symptoms may explain his sitting in the car for the extended period of time and then attempting to drive the SUV into the lake. The potential for depression and paranoia may explain his walking away and going missing (possibly living homeless) and not contacting his family. Not wanting to tell his family what was going on had me stumped until about four weeks ago. I recently had the unhappy experience of my 40 year old daughter stop taking one of her meds for Bipolar affective disorder. Bizarre and unusual behavior, lying to me, etc..and I eventually had to have her committed for four weeks to get her back on her meds. She had no intent of telling me or her doctor that she had stopped taking her meds and that she was depressed. This event brought your link above into focus for me.