Hi Thank you for asking HCM I have gone through your query.Your problem is most likely due to tension from work.Relax before going into sex.Stimulate your partner to the higher extent before getting yourself stimulated.You can also practice squeeze and stop technique.You can change your thought to something nonsexual when you are about to near ejaculation.Another helpful thing is you can put on a condom or anesthetic gel on penis or condom coated with anesthetic which all helps to decrease the oversensitization and there by premature ejaculation.If all these not helping approach an Urologist Sex therapist or Psychiatrist for medicinal therapy and behavioral therapy.Hope this may help you. Let me know if you have any further query.