Lantus and diabetes

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 have also noticed blurred vision, bloating, stomach cramps and severe muscle aches since I have once again been on Lantus. I have rheumatoid arthritis as well as diabetes, but had been off of Lantus for a while because my insurance's copays were too high. At that time, other then my blood sugar staying in the 300's, I felt so much better. My neuropathy is bad when the blood sugar rises, but since back on Lantus, I feel horrible.