I Am A 69 Year Old Woman That Weighs. 260

I am a 69 year old woman that weighs. 260 lb. I see a doctors every 4 months. Blood numbers are good, but I am tired and ache all the time. In March of last year I started. Swimming for excessive but not alb of wt lose. My cholestral and blood sugar numbers have dropped. My regular doctor is an endocrinologist., but the only direction is to lose wt, help!