Hello, you are suffering from leg and back pain. You are overweight and want to lose weight. You are suggested to do regular walking and exercises. Get connected to a Physical therapist who can help you lose weight efficiently. Take a calorie-reduced diet. Take lots of fruits and vegetables. Take also fiber rich food, vitamin and minerals. Avoid taking carbs, salty snacks, refined flour, trans fat, full fat dairy products, red meat, sugary food, packaged and processed food, etc. You should prefer to take boiled food over fried, oily junk food. Stay away from addictions if any. Taking phentermine can help to reduce weight but it comes with a risk of dependence, it is considered a controlled substance. It’s chemically similar to the stimulant amphetamine, so be careful. You are suggested to lose weight naturally. To get relief from pain you can spray pain relieving spray like, Volini. Apply pain relieving ointment on the area affected. Gentle massage may help. You can take NSAIDs, Naproxen or Combiflam, one SOS when required. Take care. Hope I have answered your question. Let me know if I can assist you further. Regards, Dr. Nupur K., General & Family Physician