Suggest Treatment For Sciatica Pain

Hi. I´m having sciatica pain for almost three weeks, ininterruptely. I´m feeling very bad and getting crazy with all these pain! I,ve already done two treatments with RELMUS and MOVALIS, 5 injections each and the pain don´t stop. Now my doctor told me to take an injection of DIPROFOS, but seemed very relutant given me the prescription... Can i have your opinion please? I'm 61 years old, my weight is around 72 Kilos and i have 1,70m.
Thank´s!