hi i appreciate your concern breathing problems may occur with obesity condition called obstructive sleep apnoea. i am glad to know that your all blood parameters are normal , you are not diabetic since you have made your mind to reduce excessive weight, you can do it try to be strict and consistent in your planning At this point of time i will suggest you to add multivitamins on your diet, avoid all kind of fried fatty and junk food be regular for exercise have plenty of fluids because dehydration can produce such symptoms you are mentioning Hope I have answered your question. If you have any further questions I will be happy to help wish you good health Dr BR Hudda