bioquest said:
I think you were saying that it's not normal to have blood in urine, but it's normally to pee mostly blood/some blood when on your period right? I mean I pee a lot of blood when I go to the bathroom at the beginning of my period
No, it's not normal. There should be NO blood in urine, EVER, not even a tiny bit pink. What you're describing is a serious problem that needs to be addressed by a physician, and should have been addressed a long time ago. I don't want to scare you, but really, there's no other way to put it. This requires medical attention. Vomiting is also not a normal thing to accompany a period.
Endometriosis is only one possibility, and it is the least serious of them, which does not mean it is not serious. With the amount of blood loss, involvement of both the bowels and urinary tract, and discomfort you are describing, it is still a very serious condition. As Danger pointed out, the amount of blood loss you're describing is excessive...dangerously excessive.
If you are not comfortable explaining all of these symptoms to your physician, print out this thread and hand it to him/her to help get the conversation started. Please, we're not physicians here, and even if we were, nobody can diagnose you over the internet. What we can tell you is that the symptoms you are describing are not part of a normal period, and it is unfortunate that you have been experiencing this so long without someone pointing this out sooner (then again, I suppose this is not the sort of thing people bring up in every day conversation), and it does need medical attention ASAP.
If you are actively experiencing these symptoms now, then indeed, go to the ER. If you are not actively experiencing the symptoms, call your physician first thing in the morning and explain these symptoms, including when you expect your next period so you can schedule your appointment at an appropriate time relative to that.