Medical-rib injury healing process and precautions to be taken?

I tripped and fell down,hitting a hard face of the parking space.I get pain in upper portion of rib,when i lie down or get up,cough and sneeze.Doctor says no X-ray is required.He advises rest.How long this pain will last?I am walking as usual but stopped exercises/yoga/deep breathing.Is it cold therapy recommended to speed up the process of healing?