Hunger pains even after eating? Feels almost painful

36 y/o Male, 190lbs.

Recently I’ve developed a gnawing pain that feels like a strong hunger pang, right below the sternum. If I run I feel nauseous in this area. Eating a lot of food doesn’t satisfy or stop this hunger pang feeling and I’m constantly feeling hungry. Medications I’m on - sertaline and concerta. Was taking a lot of ibuprofen and paracetamol in recent months but have stopped this. Have started PPI meds but no relief yet - omeprazole for a few days. What could this be?? Getting worried now.

Thanks