I've had a persistent cough for a few months and have now developed a tightness in my chest. It gets so bad that I can't get a breath. The mornings are rough with waking up to not being able to breathe. It feels like an attack. I will cough uncontrollably until I get back some breathing capability. I've also used an inhaler and nebulizer to help me open my airways. I had been controlling it ok but the last few days have been scary. Have I developed asthma?