Lantus and a1c

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.

My doctor added Lantus to my medicine regimen including Byetta 10, Metformin 1500 twice a day. On the Byetta I lost 35-40 lbs very easily. The moment I added the Lantus I was bloated and over a 2 months I had gained back all the weight I had just lost. When I asked my Doctor about the bloating and weight gain she said she didn't think it had anything to do with the Lantus. But I was losing weight until she added the Lantus! I don't think that's just a coincidence. What should I do? Should I go to a doctor who specializes in diabetes instead of my family doctor who I love dearly?

I've been on Lantus for about a year now and never tied things together till reading this. Ive had horrendously blurred vision though the eye doc says my prescription hasn't changed. I have bad bad backaches, and though my A1C is right at 6....my morning blood sugars run 130 to 185. At no other time of day is my blood sugar over 110. I don't understand this. WHY would a bedtime blood sugar be 75-90 at 9 pm.......and at 3am is over 140? Its like the Lantus does nothing. I just don't like the side effects with this stuff.