[fairity]

I experienced what you're describing after my first company failed 8 years ago. It was pretty scary to think my brain might be permanently damaged.

However, after 3-5 years, my capacity for critical thinking basically returned to normal. To this day, my working memory still seems worse, but it's unclear whether that's simply because my days are now filled with crazy amounts of multitasking.

All said, the major effects you're describing subsided after a few years for me. I did some talk therapy, and I also spent a good amount of time redesigning my personal values to not include extrinsic variables (such as being intelligent).

The biggest thing I did was just waiting for my body to recover. Be patient and if you're anxious about the time it's taking, then spend some time realigning your values to your reality, which will help relieve your anxiety.