asthmas getting me down

I've had asthma since I was 4 years old. I'm now 17 ( 18 very soon) and only recently it's got so bad. In July on the 5th I stopped breathing and had to get rushed into resuscitation on 2 nebulisers , 2 drips and different tests like ecg and in the end it was down to my asthma, I've been on turbohalers most of my life but recently got changed to a standard blue puff inhaler by a random nurse who isn't even my asthma nurse ! That was in janurary. But since I've been out of hospital I have days where my breathing is so difficult but bearable- thanks to my inhaler having to take it a few times a day it helps ease it a little but not much. I have constant tightness in my throat , a heavy weight on my chest and when I breathe in really hard it doesn't feel like fresh air just like hot air it's so weird :( but it's getting me so down, I'm so young and I can barely breathe , I had a lung function test a few weeks ago at the results were shocking :( I'm ringing my doctors tomorrow as im genuinely fed up it's making me so depressed the fact I get so breathless from walking and day to day activitys it makes me feel useless and I'm sick of it :( I'm sick of asthma, I wish it'd just go away now I'm worn out with it  :( has anyone had bad asthma at one point and then its eased ? really need some hope at this point , positive story's would be appreciated