No it's not your monitor gowing awry and the refresh should be just fine at the current setting; unless ofcourse you misfortunate soul still use a CRT set at 60 hertz
At work I still get to use the good ol' CRT, at home dual monitors.. hmmm regardless that made me a little queezy, as I have a balance disorder and basically feel like I am spinning... that just helped me out a bit hehe