I Was Diagnosed And Treated For Neurosyphilis In June, With

i was diagnosed and treated for neurosyphilis in June, with 14 days IV penicillin G . My RPR seems to be the same numbers as beofre treatment 1:128. I am very worried that I may never be cured, would another round of IV pen G treatment be effective? I do not want any painful injections IM... Is there an alternative and any hope of a "cure.?"