Lantus and stomach

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?

-shooting pain in legs, feet, and toes before i go to sleep causing me to not be able to go to sleep
-shooting pain in lower back, stomach, breasts
-stomach swelling... feel bloated
let me know if any of you get these symptoms if you are on lantus.