Help! my back went pffft yesterday morning!?

no need to see a doctor...its only tight muscles...what can i use other than heating pad (tried dont work) or narcotics for the pain (cant afford to be loopy)...its got me to the point that i can hardly stand up straight much less walk!..the kind of pain thats sharp, siezes you up and takes your breath away...ow! ow! ow!..anyone have home remedy that i can use to loosen muscles? they feel like rocks! thanks