Welcome to HCM.
Most common cause of lump in throat is stress
Other common cause is GERD
, as you have mentioned you have lots of burping it may be causing your throat lump.
Only in rare cases, a lump in the throat may be something more serious like cancer. If you drink or smoke then you are at high risk of throat cancer
. A doctor can examine you and tell you if it's anxiety or something more serious.