Hello! I Am 24 Years Old, 6'1 180lbs And Pretty
It can really be anxiety.
Detailed Answer:
Hello dear, welcome to Ask a doctor's service.
I read your query and here is my advice.
It is good that the covid19 test and the x-ray of the lungs were normal. This means that most probably the problem is not related to pulmonary issues.
I agree with your doctor that the issue may be related to anxiety. Anxiety is much common nowadays because of the situation created by covid19 and isolation.
You are saying that you don't have much reasons for anxiety but isolation and covid19 may be enough for it.
You may continue to take the treatment with benzonatate given by your doctor. Also stoping vaporizer will be helpful. Marijuana may also interact with benzonatate causing drowsiness.
Also being inactive and staying indoors can make you feel difficulty breathing.
I don't believe that reflux can cause the difficulty breathing.
Hope I have answered the question.
Let me know if I can assist you further.