Do I have gastritis or appendicitis?

Before i was being diagnosed to have appendicitis, the doctor said i have gastritis, i told her that i feel food get stuck in near chest and feel pain in stomach. But 2 days after that i had gone appendectomy.
It’s now 1 month after appendectomy. Now I feel food seems stuck below my throat and sometimes i feel something harsh in my stomach, and i lose appetite if i feel that. Is this still gastritis? Should i take the prescribe med before(omeprazole)?

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