Period problems.....?

I'm in college and my only option for a doctor/gyno is the university medical center on campus (off campus doctors offices won't see a university student without a referral from the campus clinic). I went to the women's clinic because of problems during my period. I get extremely exhausted to the point where it takes a LOT of effort to function (which sucks for school and makes studying a pain), I have back and upper leg pain (kind of muscle aches.... like how it feels when you have pulled muscles), I have blood clots during the first few days that range in size from a dime to silver dollar size. I also feel like my period is unusually heavy in the beginning, I have to wake up in the middle of the night to change my pad or I'll wake up with a gross mess. I get extremely cranky and one wrong thing and I can be in tears. This has been happening for the last few years with all of these symptoms getting increasingly worse. The one good thing about my periods is that they've always been like clockwork coming at exactly when I think they will lasting the exact number of days I expect. I told the University clinic nurse all of this information. They immediately ask me how many ual partners I've had in my life, the age I lost my virginity, the last time I had and if I could possibly be pregnant. Then when the doctor came in I told them that I feel like I loose a week of my life because of my period and that my symptoms have REALLY been interfering with my life. The doctor says "well you know what we usually do for this don't you", I have no clue....then she says "I'm gonna start you on birth control". So I've heard that people are put on the pill to help with period issues, and I trusted the doctor. I went in there expecting to maybe have some routine bloodwork run, a PAP smear/full exam done, and maybe a urine test...but they did none of that. I was never actually physically examined. I was put on sprintec (b/c it's cheap and was supposed to help with my moods). IT WAS HELL. I was on it for 6 months and I never had a regular period. I'd get 2 periods a month, some lasting 2 weeks at a time. I experienced severe abdominal cramping which on more than one occasion left me curled in a ball crying hysterically. It felt like someone was wringing my uterus out like a dishtowel. I've never experienced abdominal cramping that severe or intense in my life. I called the medical clinic and left a message for the clinic's gyno to call me back listing the problems I was having. I was told that what I was experiencing was normal and I should just "stick it out a couple months" until my "body gets used to the hormones in the pill". It never got better. I noticed that while on the pill I went from being a generally upbeat, fun, happy person who laughed all the time to someone who cried and got depressed over everything. I tried talking to the university gyno about it and was told it was all normal while my body was adjusting to the BC. After 6 months...I couldn't take it anymore and stopped taking the BC. I'm frustrated b/c I feel like the doctor didn't take me seriously. I know that my symptoms ARE NOT NORMAL....and I wouldn't have gone to the doctor over normal PMS...but my period is REALLY interfering with my everyday life. For a week each month I barely have the energy to get out of bed, I can't workout because of the back and leg pain, I go off on EVERYONE around me because I feel so bad physically....which makes me feel like a complete and utter *****. I don't know what could be wrong. I don't know what kinds of tests I should ask for (when I had the flu....they tried to give me antibiotics for "food poisoning"....I demanded to have a rapid flu test...which came back positive....and the doc to said "well..I was wrong about the food poisoning...good thing you made me think to test you for the flu....these antibiotics wouldn't have helped you at all). What should I ask them to do? I know they should have done a "yearly" exam and maybe some bloodwork....I don't know what could be wrong. anyone been through symptoms like this?