What causes shortness of breath while walking for a 51-year-old woman with low hemoglobin and fibroids? - #52993

I am mrs saranga,female 51 I have 1. Shortness of breath while walking 2. Pain in backside of chest some time 3. Low hemoglobin and Iron deficiency as seen 8 month before in iron profile 4. Having fibroids in uterus resulting heavy,long and irregular periods Test done 1. ECG,TMT and 2 D echo -All normal 2.  CBC - hemoglobin 11 Iron deficiency 3. Lipid profile- High LDL,Low HDL ,High Triglycerides and total cholesterol is normal Medicine 1. Iron tablet 15 days in Month (not regular) 2. Taking pause tablet during first 3 days of period to control bleeding Exercise : no Work: desk or standing job Want to rule out shortness of breathing while walking