Cramping and such but no period?

For the past few weeks I've been cramping really bad, feeling nauseous, and getting a lot of back pain. All these are normal signs of my period getting ready to star. Thing is, it's gone on for around 2 weeks now, this usually only happens around 4 days prior to me getting my period. It's pretty bad, too. I'll be talking to someone and freeze mid-sentence because I get such a bad, sharp pain. Is this something I should be worried about? I know this isn't something from sex because I'm a virgin. I've had my period for 4 years now, although I'm irregular as a result of what the women in my family think is PCOS since they all have it and I have all the symptoms. Should I be talking to my doctor about this or is this just a normal thing that happens?

EDIT: My period hasn't came since late September