Really sore legs at the end of the night?

i have to walk a ton for my job, i work in retail sales, and at the end of the night, my legs hurt so bad. i take a pain reliever and a hot shower to maybe to relax my muscels but they just keep like twitching and almost jumpipng. i don;t think its restless leg at all but they won't stop twitching. and it wakes me up