I'm not sure but a lot of what's going on may be withdrawal from drugs. He is probably having extreme anxiety from coming off the Lorazapam and the other drugs. He's walking around so much because he may be experiencing agitation as well as the anxiety and just can't sit still. This has happened to me in the past when I was coming off drug and it's very painful I couldn't sleep at night either. I'm not sure about the talking, unless he's trying to sooth himself. Please keep a sharp eye on him as he may be suicidal. Also keep in mind that I'm not a doctor or an expert, I'm just saying what happened to me. You need to see a Physc. Doc that specializes in drug withdrawal, and don't let any doctor tell you that drug withdrawal only takes a week or two, it can take many months or more. They give us these drugs but they forget the ramifications when its time to come off from them. Look at the website Benzos.org.
Good luck and please keep in touch with us.
Leslie