thanks for writing to us.
i would be more concerned about your troubled breathing rather than your high heart rate. Whenever we have a high pulse rate we look for the causes. there are numerous causes, some of them relevant to you are anxiety
, troubled breathing, drugs which are used in nebulizer
, excessive use of tea/coffee. Since you have been advised nebulizer it seems you have bronchospasm
(transient reversible narrowing of airways), which when active can lead to increased heart rate
i would like you to see your pulmonologist (chest and lung physician) and get your troubled breathing worked up. i hope your problem will be sorted out.