Milk for breakfast? What percentage fat? Higher fat milk will have a lower proportion of lactose per volume, and a higher proportion of fat to moderate the postprandial BG spike
I agree that 52u Lantus all at one go sounds high... do you inject it all at once or break it up into multiple sites... or consider discussing with your Doctor to break it into two doses at different times of the day.
A fasting of 120mg/dl... I wonder what you would have tested 1/2 or 1 hour later even without eating... maybe your BG was already on the way up?
Do you do basal testing?