Round Ligament Torture

I have had SEVERE round ligament pain that started yesterday morning. Walking is painful, bending at all is nearly impossible, and basic daily function is impacted at this point. Today was better, when I spent time just relaxing, but as soon as I tried to do much of anything that involved more than just sitting, the pain came back. I have been looking into pregnancy support belts, but as a plus-size woman I am concerned about fit, and finding them in a store is near impossible. Does anyone have any recommendations for relief, or for a support belt that might fit?