As others have already said.. go see a doctor and don't assume.
There's a thousand reasons why you might be having this happen, from being older, to lack of activity, to disease or other health issues, etc.
Unless you're reacting to your liquids or you're chain vaping heavily, odds are low that it's the vaping.
People with actual serious health issues that affects their lungs have not had issues from vaping after several years, if anything, most report having a lot less pneumonias and such since vaping.