I Have A Bruise Like Feeling In The Arch/heel Of

i have a bruise like feeling in the arch/heel of my left foot, i am a chef and work on my feet long hours, i started to feel only what i can describe as a strained muscle on my lower back left side a day or 2 after it started. the first couple of days after it started the bruise like feeling in my foot only started to come through after being on my feet a few hours, now it is there from the start of the day, it started about a week ago..