Should A Hernia Just Below The Chest Be Removed?

i went to the dr yesterday thinking it was my ulcer because i could feel a knot and i looked swollen just below my chest. if you push in on it it will make me curl up and the dr told me i more then likely have a hernia but didnt seem to concerned about it. Do i need to have it removed or start getting tests started to see exactly what it is. ive had this sharp dull ache nausa feeling with the knot for yrs but seems to be getting worse.. what do you think?