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is nothing but manual stimulation of own genitals to achieve orgasm. It is a healthy practice and it don't cause any effect on body. It don't cause any weakness in body. Every healthy male or female masturbate in his or her life time. You are having complaints of poor stamina after masturbation and it may be due to psychological effects. As you have weakness so get your blood investigations done. Anaemia
may be a cause of weakness. And you can take Vitamin Supplements for some time. But be assured that masturbation don't cause weakness. It is a healthy practice.
Dr. Seikhoo Bishnoi