Hi I admire you for positive outlook. It is not common. But post surgery many times that happens. No need to worry. It will go away as you start daily routine and busy in your schedule. If needed then consult psychiatrist. SSRI group of medicine will help if require. Apart from this try to keep yourself busy exercise meditation deep breathing and hyperventilation proper sleep stress free activity do pleasurable activity music and hobbies discuss with friends. All of this will help you to make stress free and gain your confidence . Thank you. Get well soon.