i am 17 going 18 im active in sex i have been having weird feelings with my body lately feeling sick sleeping haveing stomch pains back pains some shoulder pains but the shoulder pain is not everyday i have a depression problem to but for 3 years now ...i had sex nov 18th 2012 felt sick couple days after i waited a wile be4 i went for a blood test the test came back nevative but i was still feeling the same way i had sex time and time after that i got my period on dec 11th it wasnt how it narmaly been it was brown i i always have a red period wasnt feeling as sick anymore but still was sick a bit now in jan 4th i had spotting that lasted a couple hours and am feeling sick again its the 12 of jan and nothing but sickness nomore blood no period only feeling sick...any advices???