Well there's no doubt that you should seriously work towards losing weight, but firstly I would advise you to get your blood tested for Vit D3, as it can most likely be the reason for your nagging body pain. Next , focus on following a proper diet comprising of complex carbs, high quality proteins and lots of fibre.
Next Steps
Get a proper diet chart customised according to your eating habits and your personal requirements.
Health Tips
Diet is not a short term plan ...it is a Lifestyle.