Recently I've had a very severe asthma flare due to a cold and bronchitis. My question is Why am I having trouble breathing and hurts to breath but yet my stats on the oximeter say 99%? Am really having trouble understanding this. I was put on prednisone 40 mgs for 5 days then dropped, plus doing nebulizer treatments 4 times daily. 3 days later I wound up in the ER, they gave me IV fluids and IV of 80 mgs of steroids and another breathing treatment, sent me home with another 10 supply of prednisone. So here I am starting all over again. I relapsed due to a compromised immune system, my cold started over again today too. Am sick of being sick. Does anyone use a lung exerciser when well?