The roof of my mouth became raw after eating real acidic tomatoes, now everytime i eat acidic or sour food it acts up again. why?

Healing takes time: perhaps it hasn't fully healed yet. Avoid acidic and sour foods for a week, if you can.

Irritated mouth: You have an irritated palate. It will take time to heal. Some options: use Biotene mouth washes; try baking soda rinse and swish for one minute; repeat 3-4 times per day. Don't rub your tongue on your roof. Don't rub food up there eitiher.