You should have your thyroid checked for nodules or goiters in your neck (ultrasound/ sonogram) see an endocrinologist & also have a cbc with differential blood work . Stop using baby powder and perfumes with high alcohol content . Use non fragrance creams & lotions in private areas . Try using All or fragrance free & clear dermatologist approved laundry detergent. Eat cinnamon as it cuts sugar & helps you smell better. Try eating blueberries 🫐, fresh fish& vegetables ( never frozen or canned) wash hair with real strawberries 🍓 using a gentle shampoo if hair is oily use listerine original ( not flavored) on your scalp on damp hair only then a gentle conditioner. Eat natural foods not processed this should help with sweat and foul odors