I'm guessing that "5 hours later, super hungry" means you avoided eating to keep from raising your BG even more.
That's NOT managing this condition. You need to eat. Especially when you're hungry.
I'm not criticizing you -- you're doing the best you can with the tools you've been given. You just haven't been given the right tools.
Now, keep in mind that 10U of Lantus is like giving yourself a constant background of 0.56U/hr each hour over the next 17 hours. Generally speaking, for a T2 (I'm assuming that's your diagnosis) this is almost non-existent insofar as dealing with any meal carbs. ANY carbs.
Typical T2 insulin:carb ratio is on the order of 1:5 to 1:10. Even 1:10 (which insulin-using T2s would be ecstatic about!), a 25g low-carb meal still calls for 2.5U of fast-acting insulin to cover the carbs. At the levels of long-acting you're taking, if your pancreas wasn't up to the task (which it obviously isn't), it would take 4 hours for the Lantus to offset the carbs. That's if all this stuff is linear and follows basic linear mathematical behavior, which it doesn't. So, since the 2.5U you need is dribbling in so slowly, it pretty much gets lost in the noise, so to speak. 2.5U of extra insulin stretched over 5 hours doesn't cover 25g of carbs the same way it does delivered all at once.