Pantoprazole Making Me Feel Super Sick

I just got prescribed Pantoprazole and took the first pill yesterday morning. Since about midday that day I started feeling HORRIBLE. It started with chills and a weird taste in my mouth but progressed to generally feeling sick like I have the flu - fatigued, listless, like I just want to lie in bed. I don’t seem to have a fever and haven’t thrown up or anything, but I’m curious if this is a common reaction to the medication. Do I need to go to the ER?