Please try to send some light my way on this?

so i took a pregnancy test 2 days ago and it was negative.. thats the 4th test ive taken in the past month.. i went to the doc and they gave me a urine test( they denied me on a blood test.. IDK why.. they just did when i asked) ive had a lot of the symptoms.. no im not stressed out about anything or anything like that.. i just want to kno what could be going on.. maybe im not taking the test late enough.. my period came a week early in feb.. which is not normal and it was really like.. yes i know you can't supposibly be pregnant when you have your period. but it wasa mostly brown. im extremely tired all the time. can't seem to get enough sleep. ive been peeing all the time.. and not drinking a lot.. so it doesn't make since.. my lower back hurts.. my hairs super greasy.. my face is breaking out and that has never happened before ( with the acne and the greasy hair.. especially the greasy hair) im bloated.. and im hungry all the time.. ive been getting headaches off and on not like my normal headaches before i get migraines a lot since i was a child... i just got over a sinus infection also.. i just want to know if any of you guys have any ideas on what to do or what could be going on. im not paranoid. i just want to know if anyone else went thru this. i posted a question a few days ago but didn't get much info except someone sayen it was menopause.. which im only 20.... so please if you can send some light my way.. thank you...