Lantus works very well, but when you are using over thirty units for a nightly shot - that's kind of a lot, I have to suggest you talk to your diabetic nurse to review your protocol. You can use both Novalog and Lantus, but not in the same syringe and not at the same injection site. Lantus is usually administered at night to bring your glucose levels down to normal in the morning. If you have abnormal glucose levels at bedtime, one philosophy is to bring them down to normal using a small amount of short acting insulin and then use the lantus to make sure they will be normal in the morning.
Lantus is the long acting insulin.
It certainly makes sense that you should also add a short acting insulin to cover your meals. it will certainly help improve your blood sugars further.
You are the customer (ie. patient). You can insist to your doctor that you want to use a short acting insulin now instead of pills (which don't work as well as insulin);