Oh yeah, I remember when i was taking pantoprazole which is also a ppi, the pain radiates to my whole arm, it's so disturbing and feels restless, plus the upper back pain. So horrible it was one of my highest peak of anxiety. But it's almost 3 weeks since I finished taking ppi, there's still back pain. I don't know why it stays, or if it's just anxiety. But compared to last month, Im not that worried anymore and dont think too much right now... I just hope it'll disappear eventually..