Asthma? Allergies? I don’t know what’s wrong tell me your story

Since June I have been having dizziness, feeling faint, sinus congestion, trouble breathing through my nose and post nasal drip with on and off throat swelling. I ignored it bc I figured it was allergies( never been diagnosed) since I heard on tv people were developing this more and more every year. Then about a month ago I have developed trouble breathing and asthma like symptoms that are constant! I get no relief at all! Night day all the time. I went to the ER. They did a chest X-ray, ct scan, blood work. Everything is normal. They gave me a rescue inhaler and told me to follow up with doctor. The doctor told me I had bronchitis and to follow up. It has now been a month with no improvement. They are doing a pulmonary function test and referred me to a allergist. Has anyone had these symptoms? Tell me your stories and solutions! Give me some hope here because right now I’m feeling pretty hopeless and I feel like I’m never going to breath normal again!