I have been on Lantus for about 6 months. I have had TERRIBLE leg and foot cramps. I have chronic insomnia and hardly sleep at all. Can I just stop and go back to oral meds? Last night I spent almost the entire night in the bathtub, trying to relieve the leg and foot cramps. All day I am tired and just want to take a nap. In addition, I feel shaky all the time. HELP!!