I wondered if this is an anal fissure or hemorrhoids? And I wondered If an enema/ douche would do the trick?

I doubt, but.... Before doing something blindly, go to be checked and counseled so to get right diagnosis for right care. How to get all these related things done correctly? Follow suggestions described in https://ebettercare.com/feel-become-sick/. Then you gain much insight on how to work well with doc... All the best to health....