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.