I often mix (these days) 1/4th of cold water in normal water and then have it. But just in few minutes or after half an hour, there's mucus coming out of my nose. This happens more at home than outside. Because I don't face much of this issue and this instantly when I have anything cold like beverages or anything outside. Also, I take shower and come to my room and then sneeze atleast 3-4 times. It happens every other day I'll say. Or daily atleast these days. It's like I just can't have much of anything cold and also even some mild temperature changes triggers it and then there's sneezing and mucus. What exactly is the issue?