I've been on insulin for 4 days now. I remember being told to store the unopened pens in the fridge. Looking at the drug info here and on the manufacturer's website they seem to make a big deal about "NOT" injecting yourself with them when they're still cold. I've taken all my injections straight from the fridge. What I can find by searching is that cold insulin can be more painful to inject, (hasn't hurt yet) and that it can develop bubbles (I don't see any) should I throw this one away and start with a new room temperature one tomorrow or does it really matter that much if I leave it out from now on?