Tap water went up my nose and sinuses while showering. and now i am so afraid of getting brain eating amoeba. i live in croatia, europe. on web page of our water supplier it says that water is treated with chlorine dioxide..

No, but...: Many things are possible in life. The chances of catching brain-eating amoeba from tap water in developed countries is so unlikely that the answer is "no." If the water's chlorination became inadequate, it's possible that Naegleria could survive in that water. The level of chlorination should remain high enough all the way to one's tap, as Naegleria cysts are somewhat resistant to chlorine.