Doses of insulin symptoms and conditions

I have just started taking Lantus Solostar. I'm usually not allergic to medications, but this time I have developed diarrhea. The condition worsens soon after my meals, there is some amount of cramping throughout the day. Imodium helps, but only on the days I take it. The only way to avoid diarrhea is to skip doses of insulin or to have Imodium everyday.

hives, redness and severe itching on hands, fingers, and forearms. Pain in shoulder which I can only describe as feeling like I slept on it wrong. Nerve-like pain in lower legs/shins (not muscular) which comes and goes and is not associated with movement or exercise - sort of like if you had a back problem, but intermittent.