Can Someone Please Help Me?!?

Well ever since december 20th or some wheres around their like at first i had bad stomache ache's like after i atee or just out of no where like it felt like period cramps but kinda a stomache ache but i wasnt on my period though and like i would feel like throwing up well it lasted a week and went away and than my back started hurting but in between their i use to excercise to loose weight like dance , and stretch and i noticed my back was hurting a little and like each day it hurted more and more along with my stomache hurting , and feeling all tired and wanting to throw up but than it would go away after a while , and at night it went away and like it came back in the morning and it hurted all throughout the day and than it hurted like that for a week and a half and than it went away a little and like this past week it hurts my side like alot not bad bad but like 1-10 its like a 5 in a half and i been dizzy these past two days and getting tired and like my lower back hurts along with my side and i get headaches but sometimes i feel fine and it comes back like out of no where and the other day i felt like throwing up all day like i even started gagging and nothing came out and when all this first started or like the second time i went to redlands community hospital and they thought i might of been pregnant so they took a urinine test and it came out negative and like than they took a blood test and i left before we had the resutls cause it took forever but normally they would of called if something was wrong right? And plus they could of tell if something was wrong like with the urine test but it hasnt gone away since :/ it still hurts and its scary cause i think would if its something serious? and i tell my mom and grandma about it and they think im imagineing it and its all in my head and i have anxiety but i dont think so its like i can feel the pain and i dont feel like myself i feel dizzy and tired): and the pain on my sides and stomache like maybe its just cause im a teen and im 14 and im going through stresss cause im a teen and im stressing over boys , school , and maybe just little things going around and i need to relax or maybe im sick with something serious or i have a broken rib or back or something and like i am ually active , so maybe my bodys to small for and i am short and i might be like sore on my hips and back from having like but soreness doesnt last more than 3 days and its been a week and a half since i had ..idk what do you guys think?