Severe back pain

Katie • mommy to Z. & J. 👧🏽👦🏽gummi bear due 10.25🎀
I'm 15+2 with #3 and I have been having KILLER back pain for the past 2 weeks. It right in the middle of my back and nothing really seems to relieve it. I've gained about 10 lbs already but I've been steadily at this weight for about a month now. Anyone else experiencing this or have any tricks to get rid of it?