Hi,thank you for using health care magic. I can understand your concern. As you reported stop technique did not help , there is one more technique called squeeze technique. This both technique help over the time and give you more control over ejaculation. Many times using condoms and doing masturbation just before actual sexual activity also help in many men. Some proven treatment in this condition is drugs like sertraline, Peroxatine, clomipramine etc. This medicine primarily affect the serotonin system of brain, and this are used for treatment of depression and premature ejaculation. Clomipramine is can be used as and when required also. Consult psychiatrist, he/she will be able to help you in this condition through medicines as well as behavioral therapy. I hope this will help you. Regards.