I have been taking 100 units of Lantus at night for the past 4 mo...

I have been taking 100 units of Lantus at night for the past 4 months. I have gained 25 pounds, my legs and feet are swelled up, my joints in my fingers hurt, my right shoulder hurts like it has been injured but it hasn't, I have days where I can sleep all day and then sleep all night without a problem, my A1C is 9.1, I have the most painful cramps in my calves and feet, I feel like I am 100 years old and I am only 42. Houston we have a problem.