Help!

I've been very sick since october and I feel myself getting weaker and tired all the time I used to go see my horses and friends everyday ive lost all my friends and I rarely see my horses anymore and recently its gotten so bad I cant even make it down the stairs and today I was at school and started throwing up blood and blacked out twice and I have continued to throw up blood I went to the doctor a couple weeks ago for a kidney infection but ive been sick for far to long there is something seriously wrong what do I do my mom says I'm just fine and won't listen to me