Lupus & Menstrual Cycles

Hello, my name is Kat and I have been diagnosed with Lupus since I was 12 years old. I have always had issues with my monthly as a result of the Lupus; usually it is very heavy and the PMS is unbearable. However, this past month, I completely missed my period and I have no other reasoning besides stress and the Lupus. After doing some research, I have read that it depends on the person.
Does anyone else have this problem and how do you handle it (i.e. medication, not stressing, etc.)?
Thank you!
Kat