I would highly recommend a gum shield, I have one as I am a bad grinder and it's the best money I've ever spent!
My teeth have tiny cracks in them, and my gums are misshapen and "bowed" due to my grinding, and most annoyingly, the grinding has caused my first ever filling at the age of 28.
I used to have headaches all day every day but the gumshield has minimised this (I still get the odd one but it's soooo much better than it was)
The dentist also told me that my other option was being referred to the hospital to listen to "whale music"!