If you had a hiatus hernia, it is possible that with sneezing, there is an increase in intra-abdominal pressure which causes gastro-oesophageal reflux, leading to your thoracic pain. Further, Gastro-oesophageal reflux disorder, or GERD, or LPR (laryngopharyngeal reflux) is a recognized cause of hoarseness. You need to consult a gastroenterologist to sort out the problem.