Why do I have shortness of breath?

[JackieJack33]

Five weeks ago, I had a bad case of the stomach flu. During really hard vomiting, I felt like a lump was in my chest. Afterwards, I started having bad relux and shortness of breath. A week later, I was in the emergency because I couldn't take deep breaths. After numerous tests including blood work, ekg, chest X-rays and urine tests, they determined I had a bad UTI. All my other tests came back normal. I took the percription until it was gone, but I continued to have a day every 4 days or so where I couldn't take a deep breath. On Monday, I went to the doctor because I couldn't take deep breaths. After running routine physical exam, the doctor determined that my shortness of breath was do to acid relux. She started me on ranitidine. For 2 1/2 days I felt good. This morning I woke to an adrenaline rush. It lasted for 8 hours. I also had shortness of breath and I was really congested and my mouth really dry. I called the doctor and she just got back to me saying that ranitidine does not cause adrenaline rushes. She can't explain my shortness of breath. Could I have an allergy?