Yes, I'm Almost 62 Years Old , I Work Part

yes, i'm almost 62 years old , i work part time as a stocker at food lion, i was bending putting 24 packs of water out, my left leg suddenly just went out , couldnt hardly get up. i worked the rest of the night barely made it. the lower part of my left leg hurts like crap. this happened a few weeks ago . but not as severe. what could i have done, i do have osteo arthritus. what do i do