I am 42 year old female, overweight often have back pain. I fell forward over two stacked milk crates, did not hear a pop or have immediate pain, however, 20 minutes later i was unable to walk without pain in the lower left part of my back. It seems like the pain comes when i twist my back in any way. There is no specific spot that hurts if I touch it and it does not feel warm. I am used to back pain from stress and strain, but this feels different. Should I ice it as if it is a pulled muscle, or heat it?