I spent $350 on one too, I have a good dental plan. I was surprised that it wasn't covered. My dentist kept telling me how important it was, because I grinded them so hard, it was so important that it was considered "cosmetic".
I stopped wearing it after a few months. My jaw doesn't hurt very much. As far as I knew, the only alternative was the doctor's night guard, where you had to boil a pot of water, stick the thing in there, it was messy. Maybe the ones in drugstores are more convenient these days.
But yeah, it's stress. Today I'm going to try to not drink coffee or smoke. Too much stres!