I’ve never had to recalibrate my touchscreen.
Definitely try that touchscreen.gt file. It helped big time for me and I’m on the anniversary update.
In your case, it sounds like a driver issue. Check to make sure you didn’t lose your driver in Device Manager -> Human Interface Devices -> Goodix Touch HD.
There is a x98 Windows Driver package floating around this forum somewhere. Sorry, I don’t know the exact thread but it wasn’t hard to find. Grab it and try and update that driver using the files in that package. Hopefully that will fix your issue.
If/when you do get it working again, download Double Driver and take a back up of all the 3rd party drivers on your tablet and save it. I keep a copy on the tablet and on a network share.