I have been experiencing a change in my menstrual cycle for the pass three periods now. I have horrible stomach pains and naseua. I know this is common for most women but this is new to me. I also have extra saliva in my mouth causing me to spit a lot. Now my period only last 4-5 days no longer 5-6. I am concerned why my period has changed. I have never experiences this syptoms so severe and it needs to stop.