This is a dose dependent response in your case.
28% of users experienced nausea in studies.
you can stay at your current dose and lose weight...you are almost to the morbidity obese leave which is the cause of your increased requirement.
Unless you have a thyroid
problem in which case this should be correct.
The correct diet might get you down one med.
See the book called Dr. Neal Barnard's program for Reversing Diabetes, by Dr. Neal Barnard.
That said, you can try to adapt to the higher dose ...as soon as you tolerate the lower dose of victoza, then move up again......you can start the diet immediately in terms of sugar control.
Another option would be to switch medications of course.
Lantus could be increased and a shorter acting insulin regimen used instead of the victoza, another option.
Magnesium might help in terms of sugar control to some degree. as well.
Overall, I am wary of continuing on a drug that immediately causes you side effects.
There are issues about victoza, including the formation of thyroid cancer in lab animals, that are still being studied.
Let me know if you have further questions