Indigestion & Acidity. For this long.

I am 25 year old with no previous history of digestion or acidity issues. However, since September 2019, I've been having repetitive acidity and stomach issues. There is pulling pain in the stomach like I need to go to the washroom. I've consulted many doctors and a specialist who termed it as it's due to stress and anxiety however it's been more 8-9 months and I still get regular pain in the stomach along with acidity. Done various tests but nothing showed up in the blood tests along with stool tests. There is a regular discomfort in the stomach, the body seems to drop. There's exhaustion. I've taken various medicines which have been of no result. Finally have resorted to ayurveda however there are still episodic elements and haven't seem to recover. I've been physically fit and active prior to falling sick. With regular outdoor activities. However, I'm seeking an answer as so what is wrong with the digestion system to cause such issues, it's stressful to be sick for this long.