Just want to let you know that when I was on Meth I was experiencing this same phenomenon. I am not a doctor but I believe this is a drug induced phycosis. I exhibited the exact same symptoms and behaviors. I took electrical appliances, phones and computers apart and was convinced I was being watched. I would often call the FBI and report things I thought were suspicious. I was also hearing voices. I have been off Meth for 3yrs now and these symptoms are completely gone. I didn't need mental health medicine or diagnosis I just needed to get into rehab and off the drugs. If you can get him to rehab I believe these symptoms will subside. Take this seriously and do all you can to get him to go…this can get worse and develop into a long term mental illness.