negative test but still having symptoms.

Now here it is March 4th of 2008 {last period was February 2nd - 28 day regular cycle.}. Already past my period by about four days now, I have a really good feeling that wasn't my period, the bleeding I experienced back in February {24th-27th - the light, spotty, short, pink/brown/burgundy red bleeding. - my normal periods last for five days & are heavy.} Anyways, today I went to the doctors & they gave me a urine test, came out negative. But the thing is I'm still having these symptoms: nauseated - actually threw up in my mouth alittle bit earlier, sore breast & nipples & they seem to be alittle bigger - atleast alittle more cramped in my bra than usual - the thing about them being tender is it's not all day it really depends on what time of day it is (as weird as that sounds), bloated to the extreme, starting to use the bathroom a lot more, I actually have what it seems like menstrual cramps but they're not as harsh, really tired lately but finding it hard to sleep since my mind has been on this whole pregnancy thing, short frequent mild headaches, I can see blue veins in my breast sometimes they're not as dark as other times so I really don't know what to think about that. I'm really confused I mean has anyone still had these many symptoms after a missed period & a negative hpt?