Hi, amongst the problems you mentioned, the most important ones are obesity and COPD. Obesity aggravates the COPD further. Blood oxygen levels are not a botheration at this time but you should concentrate on losing some weight. Weight reduction, if you are overweight or obese, is the optimal health strategy for patients who suffer from COPD. This can be done through a combination of diet, an increase in physical activity and sometimes medication. Weight reduction can help reduce dyspnea, increase exercise tolerance and improve your quality of life. Incorporating pulmonary rehabilitation in to your COPD treatment plan may help you begin an exercise program if you are obese. I hope this helps.
Have you done anything that caused this problem? I strongly suggest you see your doctor
take care of this problem then come back for your weight loss problem