Hi, I have asthma and have bee struggling with first a chest infection which i took predisone and antibiotics for. Then after that course a week later fell sick again with a sinus infection i tried for two weeks to fight with out antibiotics however am back on them again. My oxygen levels are 93% and i have been using ventolin/symbicort and increased the symbicort as needed. The doc said there were no signs on my lungs this time but i feel light headed and short of breath. Should i be concerned