I take my needles out for the week, stick them in the travel case, in my cabinet. Then I don't have to worry about forgetting to warm it up ahead of time.

The only reason why I can find we should give at room temp is because otherwise it can be very painful.

As far as dull needles. If you are using the Auto-Inject, I suppose there's no way to really know. For those of us manually injecting, you can look at the tip of the needle. Now I've yet to see a dull needle, and I'm close to my 1 year milestone.
When you look at these needles, it's easy to see why one would suspect there are dull needles. The tip of the needle is angled.

I just think sometimes some of the areas of skin that we try to penetrate are tougher than others.

If you are going to continue to give yourself a cold shot, I'd reconsider hot packing the area prior to shot.

Sounds like you are having a hard time following the suggested rules for injection? Might be something you want to speak with your doctor about?

I know it's tough to be young, have kids, and suddenly have this tough disease tossed into your lap. Remember, compliance with the medical how-to could be what saves your health in the long run. I don't feel that playing around with this type of med could be good for the long-run of your health. MS is no joking matter.

Best of Luck to you as you figure out how to best give yourself your medicine.