hi Danish, yours problem is premature ejaculation. but keep in mind that it has not resulted because of the habit of masturbation. the reason behind your sick feeling is your anxiety and blaming to the masturbation. when u have started the problem of premature ejaculation, u have became more and more concerned about your performance and these gives u a sick feeling and heaviness. there some techniques to delay ejaculation like, squeeze technique, start and stop technique, interruption method. these all are the behavioral methods. u can also try takin anxiolytics like clonazepam 0.25 mg before sex.. if these all methods does not help then u can go for psychotropic meds which delay the ejaculation like, SSRI antidepressant medication .. u can take sertraline 100 mg, paroxetine 25 mg, fluoxetine 20 mg..daily on a regular basis and u ll be benefited within 20 days.. another option is that u can take tablet dapoxetine half an hour before the sex for premature ejaculation. i hope u ll find this advice helpful..best luck