What causes chronic heartburn and a feeling of fullness?

Hi doctor,

I am 25 years old. I want to consult about my medical condition. Two years ago, I experienced stomach cramps and sometimes heartburn, and as the year passes, it has become worse. I experience heartburn, throat congestion, and the most uncomfortable feeling in my stomach's upper part is always hard under the ribs. I finished endoscopy last year, and the result was chronic gastritis, and I finished about 1 and 1/2 months of medication:

1. Pantopraz (Pantoprazole),

2. Natrapharm (Clarithromycin),

3. Amoxil (Amoxicillin),

4. Mucopro (Rebamipide),

5. Gastroaid.

But the feeling is still the same. This year twice, I underwent a T1, T4, TH, whole abdomen ultrasound, CT neck scan, CT chest scan, Abdomen CT scan, and all the results are fine except for a diffuse fatty liver. The doctor decided to give an Antacid (Pantotrazole), and Pronerve,Vitamin B1, B6, B12. However, I still experience the feeling of full, hard stomach upper part, heartburn, and sometimes hard to breathe. I also avoid so much food, sour, spicy food, milk, and fatty foods. Please help me with my condition. I suffered these years and also the time and money I spent is quite increasing.

Your help is essential. Thank you in advance.

Best regards.