Have you been tested for diabetes? Think about the rest of you.
Do you urinate more than you used to? Do you have a "heaviness" in your chest/breast area? Do you seem to drink more fluids? Do you ever notice blurry vision - yes, even if you wear glasses. Sometimes you may think it's just eye fatigue, but if it continues it could be a more serious problem. All of these relate to diabetes.
So does the fatigue, dizziness, shortness of breath, etc. And partly because you are overweight, it is a consideration.
If you are diabetic and already know it, are you taking your meds and watching your diet? It's not always fun, but it is necessary.
Take good care.
Have you had any pulmonary function tests? Chest X-ray? MRI? It could be lung related, but could also be vascular.