From Amazon:

Harry has a problem. Ever since getting in a car accident, he's suffered from "thought seizures," violent fits in which he attacks other people. He used to be an artificial intelligence researcher, which may explain why he targets anyone who either works on machines or who acts like a machine--mechanics, gas-station attendants, prostitutes, exotic dancers. But there's hope: he can become part machine himself, undergoing "Stage 3," an experimental procedure implanting 40 electrodes deep in the pleasure centers of his brain. The surgery is successful, and blissful pulses of electricity short-circuit Harry's seizures. That is, until Harry figures out how to overload himself with the satisfying jolts and escapes on a murderous rampage. One of Crichton's earliest, playing ably on '70s fears of computers and mind control.

Caught at last month's Meetup from CasualReader.

Released on Saturday, March 06, 2004 at Altamonte Springs post office- Montgomery Rd in Altamonte Springs, Florida USA.

It's waiting on the counter in the self-service lobby...