Try a banana before meal to coat the stomach. It might help with the post-meal headaches - it did in my case.
I changed to Omeprazole from Rabeprazole and no more headache. Rabeprazole almost made me sick again - no clue what the mechanism is. Because Rabeprazole is one of the strongest PPI per milligram dose, maybe it leads to bacterial proliferation in the upper GI tract and that triggers the immune system OR the immune system reacts directly to the drug.
I changed to Omeprazole from Rabeprazole and no more headache. Rabeprazole almost made me sick again - no clue what the mechanism is. Because Rabeprazole is one of the strongest PPI per milligram dose, maybe it leads to bacterial proliferation in the upper GI tract and that triggers the immune system OR the immune system reacts directly to the drug.