Simply put most all of us have gone through that exactly...
Your brain is injured...If you get a bad cut, stitches help the wound heal faster, if you use a band aid takes much longer.

Our brains are complicated computers, some may heal in a month or two, some a year or two....

I have struggled for just shy of 12 years....I have never worked again, and I dont get much done ever...

Be positive, sleep as much as you can because thats the brain telling you it needs a rest and its the fastest way to heal.

I wish you the best, and hope you can get back to normal asap!