My Husband Has Diabetes 2. He Takes 50 Units Of

My husband has diabetes 2. He takes 50 units of insulin morning & 60 units at night. His local GP has him taking PHYSIOTENS 200, SEVIKAR 40/10/25, APRO-PRAZOSIN 5mg as well as Crestor, Lipidil, Aspirin & Ostelin. Just been prescribed Venlafaxine 37.5. He is having dizzy spells on and off and sleeping mostly all day and night. Is this anywhere near normal ???