What causes : rapid appearance of brown spots on nose, under eyes, forehead. feet cold and turn purple, sore breasts, acid reflux, popping joints?

See your doctor: You have too many conditions happening at the same time to be able to address them here, without having a physical examination done by your doctor. It sounds like it's time to be seen for your annual physical, and to address these concerns with her/him. After the exam, s/he will know what other tests to order. You may want to have your vitamin d3, and micronutrient level checked as well.