Seeing a therapist, a priest, taking soboxone (approved by a doctor. However can be highly addictive too), going to the doctor daily.
The human body can survive ....
8-10 days without water
Good luck! :)
Some of the reasons can be:
If you're a pre-teen or a teenager who has only started menstruating, you may find that it takes a while for your period to settle in and become regular.
I couldn't think of anything else, but hope this helped enough!
To find the best answer, ask your mom!
~Aurora