Whoa, IMO you need to get to a new endo. NOW. I don't know how tall you are, but at 130 pounds, I don't think you should be told to just lose more weight. I am 5 feet tall and just under 130 pounds and my endo says my weight is fine (I am pretty muscular).
What is your A1C?
What is your fasting BG?
Have you had your c-peptide/insulin levels checked?
Have you been tested for antibodies?
Type 1 diabetes (which is when your body isn't producing enough insulin) is usually the result of an autoimmune disease. There is no diet or exercise that can stop this process and it can start in adults (contrary to what many believe; about 50% of people with type 1 are diagnosed as adults). In some adults, the onset is slow, so at first they may seem to benefit from dietary changes, exercise, and oral medications. But the need for insulin is guaranteed.
Did your brother die from DKA?