15 Weeks And Losing Weight

im at week 15 now. i can eat but i cant eat alot. like a fish n chips dish, i eat only a third of eat and i feel full. if i were to force eat, i will vomit. so i always stop eating before i feel too full. i always get the want to vomit feel but most times nthg come out. i take gaviscon and it helped with the indigestion.