Your initial symptoms are very consistent with an episode of severe reflux. It is difficult to tie this to the lymph node swelling. Perhaps you have a virus that has inflamed your stomach and esophagus lining as well as is causing your lymph nodes to swell.
If you do not see improvement in the next 1-2 days I would recommend that you see your doctor for an evaluation.
Advice and opinions given are based on the information provided and must not be considered an official medical recommendation. The limitations of the internet prevent an appropriate evaluation. Always consult your doctor if there is concern.