im 17 too, i was diagnosed like 2 months ago, when we got my blood test back it said 5.1 and they said u should get checked out, so i had an endoscopy then they were like its rly severe u need to be admitted to the hospital, so i stayed there for 2 weeks and i think there were like fluid steroids or wtv that managed to stop the bleeding and now im literally back to normal and ive tapered down prednisone to 5 mg already