Urgent care or ER

I’ve been experiencing lower back pain on the right side / neck pain and spine i guess pain? i say spine because if i try to twist my body either side it feels like my spine is tight and being twisted. ) And kind of sharp pain on my right shoulder blade area. for maybe about a month or two. I work in an office at a desk for 8 hours and it’s hard to keep my posture good because of the chairs and the way the desk is set up. i’ve assumed the pain is from work. i literally can’t sit down . Tonight i just can’t take anymore because it hurts so badly. Is it better to go to the er or urgent care? I feel like er will just dismiss me as they always do and tell me to go to a certain doctor. But i don’t know what an urgent care could do without a mri or anything…. I’m at a loss. I’m dreading going to work tomorrow and having to sit in pain for 8 hours.