Holy back pain! And 18/19 week bump!

What have you ladies been doing to help with it? I am between 18-19 weeks. Due date is fuzzy, between December 10-15. My mid back and low back muscles along my spine and hips are sooo sore!! Heating pads work for a little while. I'd love something that lasts longer. And, Here's my bump! (After breakfast and lunch lol) anyone else's bump bigger as the day goes on compared to the morning?