Shock Bracelet on a recurring timer

Looking to make a Pavlok-type device to administer a small shock every half hour to an hour, or when spending too much time on other devices. I'm in uni, and right now very behind on courses, and with ADHD not helping, I'm trying to get back on track, while trying not to pay 200 bucks for a watch that I could potentially build. I'm trying to figure out how the electric shock is administered, because the best idea I've had so far is ripping apart an electric shock pen and using that. What other ways can this be achieved, if there are any?

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