Have Diabetes. Taking Insulin, Metformin, Duloxetine, Ramipril. Stiffness In Shins, Hip Pain, Fatigue. What Is Wrong?

I am 48 years old and was first diagnosed as Diabetic aged 33. I am slim and active with no family history of the disease. I am currently prescribed Insulin and Metformin also Duloxetine and Ramipril. Over the past 7 years I have experienced many varied symptoms. I have episodes when I feel stiff and constricted across my shins but am still able to manually flex my lower legs and ankles. It feels like my muscles and tendons are tight as though I have run a marathon, this is particularly so first thing in the morning along with numbness across my face and down my forearms. I have pain in my hips and heavy sensation in my legs particularly after resting or inactivity. I have bouts of fatigue and times when I fear I may fall asleep at work, in meetings or whilst driving. I often lose my balance, suddenly with no apparent cause. At times I need to make a conscious effort to walk straight. Sometimes it is an effort to walk at all let alone run. I cannot walk heel to toe without falling over and have difficulty keeping my balance in the dark. I am unable to look directly up without losing my balance. I feel like I am going mad, I have experienced at times the feeling that I cannot understand what is being said to me, as though I am hearing a foreign language. My immediate memory causes me trouble, following the thread of a conversation or recalling what I have literally just thought about. As I said I feel like I am going mad, I mostly cope by trying to ignore it. I am a very active outdoor person with no time to be unwell I just want to get on with my life ... what is wrong with me?