Dizzyformonthd

Hi let me just start, I'm 17 male and about 5 months ago I got a weird vertigo dizzy attack in the back of my head. I never had this and it lasted like 30 seconds. Everything was normal until next morning when I woke up so fizzy and nauseated. I couldn't do any for about 25 days because movements made it worser. Since I was in juvenile hall for not telling on my buddy there was nothing I can do. At times I felt like maybe it was stress or anxiety for being in juvenial hall for about 3 months. After I got out I went to the doctor and he did test ( like walk in a straigt line kinda test . Reflexes test too . He gave pills wich lessen the dizziness and nausea to about a 2 out if 10 in severness. I don't know if it was the pills that took away the bad feeling or the fact that the doctor said he didn't think it was a tumor . I'm still so scared if can be a tumor because the weird dizziness feeling in the back of the head has not gone away. It's 24/7 ... It doesn't bother me in my life but now it's dealing worryieg me. I also have ringing in my ears but it's not constant . I don't have no neirological problems either. Can u guys help me . What do you guys think? Do you think this could of been a stroke I had?do you think it's a tumor?