Hi and welcome to the GERD forum,
Yes, reflux can cause the lump in the throat sensation as well as bad breath.....u should see ur Dr for testing to see just what is going on....in the meantime, exercise, eat healthy and avoid triggers..ie- spicy , greasy, acidic foods as well as carbonated bevs, and caffeine and alcohol...elevate the head of ur bed and do not lay down for 3 to 4 hrs after eating...there are more tips on foods that are safe to eat and those to avoid in the Health Pages-
http://www.medhelp.org/health_pages/list?cid=236