Hey Cathleen and welcome!
Don't think that a splint will damage you in every case. Prolonged splint useage does cause some damage to your teeth, compression and the like. However, you can't discount the good a bite plate can do for your grinding. Mine stops me from grinding at all...sometimes it gets on my nerves, but I realize that it's really protecting me from further damage.
It's when I don't wear my splint, or it doesn't fit correctly that I run into problems. Your doc really needs to maintain the appliance for you when he gives it to you. Everytime there is a even a slight change to your mouth he will have to adjust it. If you don't take care of your splint, it can cause damage.
Hopefully you'll only have to wear it at night....feels weird for the first week or so, but you do get used to it!
Good luck and take care,
Jennifer