My husbands stomach aches all the time, and more so after he eats... he also hurts on right side, but thats where his tumor is..... the GI Oncologist can do a procedure (which my husbands is not scheduled yet) its called a Celiac plexus nerve block..... the so a scope and do an injection in that spot and its supposed to take the pain away 6-8 months.... maybe that can be an option for you?