Sorry to hear about your difficulties.
Do you have better control with the pump or with shots? Personally, I'm scared silly of the pump... it just seems like there is too much that can go wrong... but that's my opinion, and you know the saying about opinions.
However, because you are pumping, you can tune your basal rate without the 24-hour commitment Lantus requires. I'd have plenty of fast-acting carb, a glucagon shot, and a trusted friend or family member close at hand.
I agree with Tanya that your symptoms sound more like hypo symptoms. It could be that your body expects higher sugars. It could also be that your basal rate is too low, so your cells aren't getting their required glucose -- no matter how many fish are in the pond, one will be hungry if one can't eat them.
Perhaps try gradual adjustments. Get closer to your target... but at a comfortable pace. Rome wasn't burned in a day. And have a trusted person close at hand... that should help with confidence, which may itself help your glycemic control. (I've found that strong emotions can mess with my BG.)
