I couldn't help noticing your screen name! I just started taking Myrbetriq and it's giving me horrible headaches. My nose also started running and I felt like I had a fever yesterday (the 4th day I took it). I've tried all the overactive bladder medications on the market, and none of them caused anything worse than dry mouth. I think there's something really wrong with Myrbetriq, and it should be a medication of last resort, if it even stays on the market at all.