Back hip and knee pain

Yesterday I bent over and when I went to come up there it was massive back spasm. Iv had these for years now but this has made it constant. Finally after 2 days my pain dr finally is getting me n this morning. I thot I was going to have to go to the er. Its a sharp pain from my lower back that goes down into my hip then down to my knee. Like I said iv been dealing with this for at least 8yrs but its been off and on this time its not letting up . Iv used a heating pad for 2 days with little relief. Any suggestions for any kind of relief. I no my pain dr wont do much I dont think he even believes n fb . He just days everything is arthritis related . Im trying to find a new dr but for now hes all I have