“What medications help with gastritis?”

Have to be careful with this one. Most gastritis does not cause symptoms, though many health care providers will tell you that gastritis is the cause of your pain or some other symptom. But it is best to see a GI doctor to confirm. Acute gastritis is definitely associated with pain, but chronic gastritis is not.
So to help with your situation, I would need to know exactly what symptoms you have, whether you had a formal diagnosis of gastritis by upper endoscopy, whether you have H pylori infection, etc.