Hello Welcome to HCM I really appreciate your concern and i gone through your query, not to worry, masturbation does not cause to negative effect to health as well as kidneys but yes any things did in excess will effect to body as well as muscle in some negative ways so control your emotion by yoga and meditation and do masturbation in some limit and whenever you feel weakness increase liquid intake ,water ,u will feel energetic in some time. I hope this answer was helpful to you! Please kindly rate it and write a short review about your experience with me! Thank you and best regards! Dr dinesh