[Releases that thumb finally, sitting up on his knees before wrapping his arms loosely around Sam's head, pulling him closer so Sam can rest his head on Jewel's chest, fingers combing through Sam's hair slowly while he talks]

I'd ask if there's anything I can do....but sometimes things just feel bad and there's nothing to be 'done' about it other than ride out that feeling. I'd offer silver-linings about how you were able to help today, but I know that doesn't change how you feel about the times you couldn't.