I was on this for about 9 months. When I first started it, it was soooo much better than my previous B/C (Ortho Micronor. I had a migrane and nausea nearly every night for a year, but I was breastfeeding at the time so this was my best option then)
So when I first started this I was so relieved that I didn't feel sick and felt pretty normal. After a few months my relationship started to get worse & worse. Everything my boyfriend did irritated me and I'd pick fighs with him all the time. I'd cry at the drop of a hat, and I'd scream and yell when I was mad (I am usually a very soft spoken person) A couple people actually said they were concerned and thought I was depressed.
Along with the emotional side effects, I started spotting in the middle of the month, and my periods were over a week long. For two weeks out of the month I was either spotting or on my period. (I tried just leaving the ring in to skip periods but I always bled anyway) I had 2 yeast infections in two months; both started a couple days after I inserted the nuvaring.
I threw out my nuvaring after my last yeast infection in July and decided to go hormone free for a while. Sure enough my moods improved, my relationships improved, my periods were more regular, and no more painful yeast infections.
The nuvaring was a great idea in theory, but the wrong mix of hormones for me.