If you prevent all the security threats, nobody notices, and the bosses wonder why they even pay you. If a security issue gets through, the bosses wonder why they even pay you.
Meditation could be helpful. Maybe the "Muse" EEG headset might be something for you.
Medication shouldn't be out of the question to stop the stress from killing you. I don't need to know any specifics but just when you say "stress" and "overweight" I can tell you to get checked for at the very least sleep apnea and diabetes. Both can and will ruin your day if you don't catch them early enough, and most people don't.