Lower Back Splitting in Half

Hey ladies! I'm a teacher, so I'm on my feet all day. During my last week of school, my lower back felt like it was being ripped apart by the end of the day! I've been on winter break for two weeks and have been taking it really easy (also I had a cold and that nausea 😩) so it hasn't been bad but yesterday I went grocery shopping and by the end it hurt SOOOO BADLY!!! It's a super low back pain. Anyone else have this? Any tips for relief? Should I get those nurses clog shoes? Would it be worth hearing 100 teenagers comment on them?! 😂 Also, I'm 10w4d and wondering if this will end soon or if I should keep expecting it?