Shortness of breath, heavy chest, dizzy/lightheaded periodically. Any ideas?

I am pre-op. For a few weeks I have been having periods where all of the sudden I get short of breath and my chest feels heavy. I can breath but only very shallowly and sometimes have to gulp like I've been running very hard. Nothing usually precipitates these symptoms except sometimes I get hot and nauseated too. This last about half an hour and then I feel better but exhausted and wiped out. Has anyone had these symptoms, what is going on?

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