Yeah, if the mag citrate is the only new thing, then it must be too much... Try taking less. I needed a bunch of days to figure out what will work for me. I was usually taking too little, so I was still being C, but one time, I tried 4 fl oz and I god D too... it kind of felt nice, though, because it was easy to go to the bathroom, LOL (I was so used to having a hard time in there...)
Anyway, magnesium is good for you so don't fear experimenting with the dosage