Hello, thanks for query. You have taken antibiotics orally ( mouth) so that tab ( capsule) might have caused oesophagitis ( inflammation of oesophagus (food pipe)). The irritation produced by antibiotics is the main cause of nausea
and feeling of intense pain in the chest. So pl take some antacid
after consultation with a doc. Mind one thing that nothing is wrong in your chest so don't bother because it will give you more anxiety
. Have a happy life.