I am a newbie here and am 10 months into my mitral valve replacement with a mechanical valve. I am doing fine most of the time but I seem to be aware of every little pain and ache in my body which takes me to the internet to research. I know that I cannot believe everything I read but just cant stop myself from doing that. I had a maze procedure done along with my OHS since i had AFIB two months prior to surgery. I seem to be in sinus rhythm but I also experience skipped beats and fast beats atleast once or twice a day. My cardio doesn't seem to be concerned. The most recent developement was that my cardio reduced my atenolol from 100mg to 50 mg after being on 100 for almost a year. All was well for almost a month but then slowly I started developing headaches and they dont seem to go away completely. I find relief from Tylenol but I dont want to keep popping them all the time. Has anyone experienced this ?? and when is the time to go get an mri ?? is MRI safe with a mechanical valve??My headaches have been going on for almost a month and I am also going thro pre menopause.