I’m so sorry you’re having that problem. I have also struggled with bruxism and have already lost a tooth to it. I cracked it all the way down the root and had to have it removed. The pain was unreal. I’m sure I have several minor cracks in other teeth, but as long as I don’t grind, they don’t hurt. Even a little clenching will make the pain act up. The guards just didn’t work for me. Their presence just made me want to chew/clamp down on them, which made the problem worse.
Since you’ve recognized that stress is the major cause, it might help you to identify the stress factors and find ways to deal with them. Several years ago, my mom started to develop dementia. Sometimes she would get really mean and my grinding/clenching was related to those episodes. Identifying the trigger made it easier to stop. I found that distracting myself by sucking hard candy or popsicles helped a lot. You’re not as likely to clench if you’re sucking a popsicle. Also, my doctor prescribed Valium for when my mom got really bad. Oddly enough, just having the Valium available helped. I’ve rarely had to take it. My mom eventually realized her episodes were hurting me and she got some counseling to help her control the anger. Since then, my clenching has all but stopped. If it’s caused by stress, getting the stress factor under control is the cure. Everything else is a band-aid.
Good luck! I wouldn’t wish this on my worst enemy.