No. I would see a gyno about it- they know a lot more about reproductive issues than most docs.

The easiest thing to rule out is your diet- are you a healthy weight/ getting enough nutrition? Otherwise, there could be a medical cause. Most likely nothing too serious.

It does sound like a stress issue, but you might also want to see if there is something else causing it. It could be a hormonal imbalance and that's not healthy. It will cause too much estrogen to build up in your system which can cause a lot of problems in the future. It is important that you talk to your doctor about getting your cycle back on track.

Are the cramps constant, or is it like you feel as if your period could be starting and can't?

How long have you been missing your periods for 6 months at a time?

http://www.mayoclinic.com/health/amenorrhe a/DS00581/DSECTION=3