I'm not sure what options you are looking for, but if I were you, I would focus on getting medical attention for the hydrocephalus and cysts, not wondering what may have caused them.
The facts are that a fair number of people who have never had an AN or FSR treatment get hydrocephalus or cysts, and a fair number of people who have had an AN and FSR treatment do not have those conditions. While it is easy to think that they may have been caused by the FSR, it is almost impossible to say that they definitely were. I'm not sure what it would get you anyway. I see no use in dwelling on it.
I think hydrocephalus is usually treated with a shunt to drain excess fluid and reduce the pressure. They sometimes do surgery on cysts, depending on where they are and what problems they are causing. I would go to a neurologist or neurosurgeon and get the conditions evaluated and treated as needed.
Best wishes and I hope you are able to move forward.
Steve