Side effects

I have taken Victoza now for about 3 weeks. My doctor has prescribed off label as a last resort before insulin as he believes it is not the right time yet. I have experienced nausea and a decreased appetite which is not a great thing since I have no extra weight to lose (barely able to lacteals for injection sites). I have been able to manage these things but I am experience significant constipation and sometimes stomach pains. Is this something that is common and if so, any suggestions?