I've never been camping in winter before. Does it have much difference with summer? Do you take a solar generator https://generatorpick.com/best-solar-generators/ or what do you use to recharge your phone and warm up the kettle?
You can try knee pads, and choose the best one for you https://www.bikethesites.com/mtb-knee-pads/ also it can be due to the absence of comfortable orthopedic shoes and incorrect posture. In any case, visit a doctor.
This photo was taken by my DJI drone https://www.extremefliers.com/best-fpv-drones/ the second one, shoots great and makes a little noise, but it's ok. This is Iceland in winter, I was there a few years ago.