My husband has finished his second go-around of chemo,(one month ago) had a PET Scan and cancer does not appear to be spreading. However, he is experiencing extreme exhaustion and leg/hip pain, minor stomach upset. He's going to try to have some blood work today. The last time he experienced this, his sodium levels dropped dangerously low and he was hospitalized for 3 days. His symptoms are similar except the last time this happened he had severe stomach pain. Has anyone experienced low sodium?