About 20 days ago I carried my kid for about 4hrs. The next I could feel pain in multiple places. Upper back muscles, under arm muscles, ribs below under arms. Doctor prescribed me muscle relaxants now my upper back and under arm pain is very little. But my ribs are still hurting. I got the x-rays and dorsal spine MRI done but nothing major in them. I am getting worried now because it's been so long. Please suggest.