Mealtime issue. Need urgent help.

My 2.3yr old son won't eat. He is sticking his mouth shut on every mealtime I have tried changing his recipes.but to no avail. If he sees a tasty dish like chilli chicken (homemade) he takes one or two bits and that is all. I don't know how to make him eat wholesome meals. He is refusing fruits as well. He doesn't drink milk right from the beginning. Nothing medical, he dislikes the taste. He used to have one chapati and mixed veg for breakfast and a filling lunch and dinner. Now it is totally the opposite. Due to this his weight dropped by 600hms last month but has come back to 11.3kgs this month. His paediatrician suggested polybion syrup 2.5ml twice daily 30mins before mealtime. But it doesn't seem to work. No distractions work for him either. Child is eotherwise very active. Some pointers I should mention: 1. We don't have a separate dining arrangement. We eat on sofa or bed. 2. We feed him first and then we ourselves eat later. How should I tackle the situation?