Is this really acid reflux?

Well in 2007 i went to the doctor with problems of a nasty sour taste in the back of my throat and constant nausea. For the past year I've basically lived in the doctors trying to find something to help with my nausea. I've also had pain in my upper chest but mostly the feeling of a lump in my throat. About 4 months ago, my doctor put me on the generic of Prilosec. Well it helped my stomach with the nausea but seemed to make the lump feeling worse. For the past week, I quit taking an acid reducers (other than tums) and I've noticed that I feel better now than when i was taking the medicine. Could it be that stress is my cause? I dont wear tight clothes, or lay down after I eat. But my husband however is deployed and I'm very stressed with being at home still with my parents. But I take a zantac whenever I eat something that I know is going to hurt me (chocolate, spicy, citrus). Is there a way that I can ease the lumpy feeling without the doctor, cause they dont seem to be helping me.