My daughter, who is neither a smoker nor a vaper, was recently experiencing similar symptoms to what you have described. She went to her doctor who diagnosed a severe case of GERD, for now which she is being treated. Gastroesophageal reflux disease - PubMed Health
Also, when I first started vaping, I suffered from horrendous acid reflux. My 'chest pain' was from the niquids getting into my stomach and pissing it off. Soooo.... see a doctor and make sure it is not something terrible, and/or try a really good antacid medication?
~Tiger
that was my thought too.