60 Year Old Female Type 1 Diabetic For 51 Years,

60 year old female type 1 diabetic for 51 years, my control is good last A1c 6.8 CABG surgery 3bypass 12/16 at Cleveland Clinic. Since last summer I have extreme fatigue most days from 5 pm to 8 pm requiring at least a 2 hour nap. On insulin beta blocker, losartan potassium and Crestor, are my meds to blame? I have also put on about 8 pounds over the past 6 months, I hate the way I feel!