C.A.
Hi S.,
Yes, you should definitely see your OBGYN. You might not have PMS, it may be PMDD - premenstrual dysphoric disorder. It's like PMS, but more severe. It's tough to live with. You may need a different birth control pill prescription. There are also medications, if you are okay with going that route.
Good luck!
C.
Here's a website with some info: http://pmdd.factsforhealth.org/