Can there be complications with mono if I have diabetes?

Probably Not. Diabetics are at a slightly increased risk of complications when having an infection. It is a good idea to monitor your blood sugars more frequently when you are sick, however, if you are otherwise healthy and your diabetes is under control, then it is likely that you will have "typical" mono. Still, take extra precautions and work closely with your doctor.
Even w/o diabetes. Mono: caused by 1 of 2 viruses (epstein-barr ebv) most cases, cytomegalovirus (CMV) causes fewer. Usually sore throat, fatigue, swollen glands fever, poor appetite. Can get big spleen, hepatitis, jaundice (yellow eyes), joint aches, neurologic problems, anemia, other. Diabetics can get this stuff too, only bigger issue because of dm. Rest, no alcohol., eat. Usually lasts 2 weeks, up to 6 mo.