Birth control help

okay so I've been on the nuvaring for about 8 months now. it has been wonderful in that it's done its job. 
however I have had 3 UTIs since having it and they seem to correspond to when I put the new ring in. 
I also have felt my libido is so much lower than it was before.
finally I feel like I am significantly moodier.
has anyone else experienced these problems? I don't want to go on the pill because I am absent-minded. the depo shot is the only birth control correlated scientifically with weight gain so that's a no. would anyone suggest the rod implant? what side effects can I expect with that?