Sounds like you have Multiple Impact Syndrome. It can leave you with permanent dysfunctions. Your age also is problematic in that the brain has a difficult time healing. It is struggling to slow age related degeneration so healing is a big task.

Your best bet is to work at learning the many work-arounds and accommodation many of us use to live a full and higher functioning life. This starts with learning to understand your symptoms. The you need to learn what your triggers are. Avoiding the triggers is important.

The word finding can be frustrating but a simple comment, "I have a brain injury and sometimes my brain gets stuck trying to find a word." works well. Those close to you will understand and give you support.

Understanding how your environment (visual and auditory) effects your ability to function will help you learn to avoid such environments.

Focus or concentration struggles are tasks that takes time to learn to overcome or reduce. I will close my eyes to try to clear my head so I can concentrate.

Welcome to the world of "over with 40 PCS." Your life will go one. Learn to embrace the new you.

My best to you.