Everything I Eat And Drink Makes Me Sick And Sometimes

Everything I eat and drink makes me sick and sometimes pain, light headed. I had whirpol procedure back in 2010 and if this is Dr. Gupta from Springfield clinic you did my chemo for this. Been living like this for 8 years I deal with it because I am alive where I heard many have died from this. Question is there something possible be wrong with stomach I still take the Gabapentin 100 you prescribed is there something else?