Just wanted to chime in here and say I get like this everytime my period is due. My mom used to be like this too when her friend was due. It is completely normal as it's a way of our bodies getting ready for our friend to come along and basically cleansing Itself. You also do need to drink more water too, you don't want to dehydrate yourself. Also stress and anxiety can delay your period too as well cause it to skip or not come at all! There might be spelling errors, I'm typing this on my phone at the moment so it is hard to read what I typed!