Ct chest w/contrast found multiple tiny nodular densities within lung parenchyma. how serious is it. i get sob when i bend over or do yoga exercise. ?

Possibly: These are unlikely to cause shortness of breath. Most commonly these nodules are evidence of a prior infection such as histoplasmosis, especially if you have resided in the ohio river valley, or less likely tuberculosis. These are known as granulomas. However, other causes are also possible. Your doctor that referred you for the scan should be able to determine if you need more tests.