Hon this happened to me last when I got a cold, you should really go see GP today and get a preventative, they take a while to work but that in conjunction with the ventolin should work. also my GP made me go buy a spacer to take the ventolin to breathe more in, I could hardly breathe for days and even when lying down I couldnt lie on my left side to breathe. I took ventolin every 3 hours. Ive got the same darn cold again now so am upping the meds now so it doesnt get worse again. Hope u feel better soon.