Blueberries are good, but you should read the ingredients on that box of Jiffy. If you dont recognize some of those substances, you should not put them into your now getting healthier body. And there is no nutritional value at all in white flour, not much in refined corn meal either. You should also stay away from anything saying hydrogenated or partially hydrogenated, because those fats clog arteries. You need your blood flow, girlfriend!
If you are feeling as lousy as you told us, baby steps are good, but might not be enough. Label reading is very powerful!
Wishing you good luck on this journey to better health.