Get your CBC done if Hemoglobin is less then it can give you such symptoms. Also you mentioned that getting up from sitting position gives you light headedness then BP could be an issue and needs monitoring. Walking from one room to other gives u breathless so could be related to any recent or any heart problem by birth - need to rule out congenital heart disease
Next Steps
Get CBC, BP monitoring, 2 D Echo or Echocardiography of heart and
Thyroid Function Test.
Health Tips
Have your Meals on time, drink enough water and monitor BP and never be alone in the house.