Hello, I am very sorry to hear of the situation you are dealing with. Jaw clenching, forgetfulness, concentration issue are all pointing towards deeper rooted issues including, but not restricted to, anxiety. Professional help is required for what you are facing, since this may intensify making it difficult for you to function effectively. There is also a history of anxiety and depression, which needs to be addressed.
Next Steps
Please seek a mental health professional. You may reach out to me, or any one else of your choice.
Health Tips
1. Do not chew on anything that is not food (during the day).
2. Practice jaw relaxation.
3. Practice overall muscular relaxation.
4. Trying meditation.