question: my mother is a breast cancer patient she took all the chemo and radiation tests a year back.then doctor gave her tamoxifen to use for 5 years. now she is having severe cough which is not stopping at all for 3-4 months. we went to physician got lung x-ray done it is normal, blood test done,BP is normal she has 9.8gms%haemoglobin.she took anti biotics but cough is severe she cannot sleep properly.is it related to heart problems please give me suggestion.