You really should get a CT scan with contrast to rule out pulmonary embolism(blood clots in the lungs). This is a real possibility, especially if you're on birth control pills. Please do a google or yahoo search and check out the symptoms.
DO NOT DELAY!!!!
I am pleased that you plan on seeing your family physician soon. Make sure that he/she gets copies of your sleep study and any other tests. I am not a doctor, but with you finishing school it sounds as if you might have a lot of stress. I used to hate hearing that from my doctor because it seemed like they were saying, I don't know, it is probably stress. I was diagnosed two years ago with emphysema and I am amazed at how I can actually feel how stress affects me now. It is a very powerful thing and can manifest in many ways. Also, I would urge you not to rule out depression. Can make you feel very fatigued. Good luck to you and hope you get to the bottom of this.