My biopsy showed grade 1 invasive ductal carcinoma, and i have been feeling short of breath and light-headed. could this be something besides stress?

Breast cancer: Fortunately you have been diagnosed at an early stage of this malignancy which may be curable with excision and/or XRT. Since we dont know anything else about you including your age, social habits or medical history, its not possible to comment on why you have SOB or light-headedness. It is extremely unlikely to be related to your recent diagnosis. You may be experiencing anxiety with panic attack