Will memory loss due to masturbation come back?

Not the cause: Whoever told you that enjoying your body causes brain damage is either an ignorant fool or someone who is lying to you for their own malicious purposes. There is nothing "spiritual" about telling -- or believing -- such an obvious untruth. For your own sake, talk with some sensible grown men -- maybe even a physican and/or dad -- about your body, and ask your physician if memory's a problem.

Not related: Both in my practice, and reading the research, i cannot recall ever learning about any connection between masturbation and memory loss. It would be helpful if you could explain who specifically suggested to you that there is a connection, how old you are, and any other relevant information. Perhaps many others have similar concerns but don't ask.