Okay moms, I'm being paranoid again. My back is hurting like the last time I had a stomach virus but…

Okay moms, I'm being paranoid again. My back is hurting like the last time I had a stomach virus but unlike last time it goes away when I stand or have a pillow under my pelvis. I haven't work in two weeks and now I'm working 6 hours a day for the last two days. Could that be why it is hurting? I'm praying so hard I'm not sick. I just started my new job and can't afford to miss any days.