Dude, have your pupillary distance checked. I got a pair of glasses from warby parker and used their "hold a business card to your nose so we can guess at that measurement". This pair was instant fucking headaches until I went into one of their brick and mortar stores and they checked things.
The focus point for my lenses was a good 5mm below where it should have been. My eyes are fucking bad and so I was basically looking through the distorted edge of high index lenses.
A quick trip back to the shop for the lenses to get redone and now I can wear them comfortably.
This is for anyone having issues with new glasses - if your prescription hasn't changed that much from your prior year, but new glasses hurt or are severely uncomfortable, get that shit checked out. That shouldn't be the case.
For you, @OP - if you've always had a script but never been able to use your glasses due to headaches/motion sickness, get a different eye doctor. Don't just go to a mall lens crafters, try to find an optometrist whose name is on the door. Tell them your symptoms. They should check your eyes for a plethora of things - maybe you've got astigmatism, or something else.
It's not normal to have a severe reaction to glasses if they're the correct match for your eyes.