PMT or quitting smoking withdrawal?

Which would you prefer? Just kidding :-) I have quit smoking (cold turkey) after 10 years and I'm on day 3 now. I thought symptoms were meant to peak on day 2 (up to which I was great- a bit tired, lightheaded, but happy). Suddenly I changed into this crazy woman- irritable, angry, snappy and then suddenly feel like I'm going to cry all the time. I haven't been tempted to smoke but I just wanted to know is this more likely be PMT or withdrawal symptoms as it's that time soon (great timing)? Does anyone have any tips to relieve symptoms. oh and I came close to wanting to kill a colleague today :) Is this usual? x