Lantus and dizziness

I've used Lantus since may of 2004. I gained approximately 20 lbs in about 2 months and experienced the following: nausea, feeling cloudy, dizziness and headaches a few times a week. My blood sugar is always between 80 to 120 probably 8 out of 9 glucose tests. I didn't take Lantus for one week and after 24 hours all of the negative symptoms were gone. However, my blood sugar was higher between 140 to 200 but I felt 100 times better. I'm going to attempt to get stronger pills than the 60 mg of Starlix I am taking and/or different insulin.