My first impression from your post is to try to look back at the day and night before your good day. I bet you can find some characteristics from that day and night that include a distraction from your condition and also a better night's sleep.
I have those great days, too, and for me, they always follow good sleep. My wife can see me sleeping well. She says the peaceful look on my face is indicative of good sleep. Unfortunately, I don't get this peaceful sleep as often as I would like.
What testing have you had? Have you had a full NeuroPsych Assessment? It can help you identify your working vs struggling functions. A vocational rehab specialist may be able to help you understand how to move forward vocationally.
I don't think that pushing will negatively impact your brain. Rather, it will just return you to your worst condition.
In my case, I have had to learn what my limitations are, including triggers, levels of effort, and how to recognize impending fatigue. I can maintain a productive activity level for quite some time. I need my breaks and rest. I also need to recognize those days that need to start at 12 noon rather than 8 or 9 am. A nap after breakfast allows me to achieve the full function level I need get going.
I was able to start understanding how to move forward once I had a full NeuroPsych Assessment so I could accept and let go of my struggles rather than get frustrated and try to force through my dysfunctions. I learned work-arounds to deal with my memory limitations. I learned how to avoid over-stimulation. It allows me to be very functional and active.
I hope you can find those characteristics that lead to your good days. What were you doing the day before? What kind of thoughts occupied your mind the day before?
My best to you.
Mark in Idaho
58 years old, retired due to disability, married 33 years, father of three, grandfather of four, Suffered a serious concussion at 10 years old (1965) stopped most driving after last concussion at 46 years old (2001), Post Concussion Syndrome/Multiple Concussion/Impact Syndrome with PTSD, immediate and short term visual and auditory memory problems, slowed processing speed, visual and auditory processing difficulties, insomnia, absence seizures, OCD, 14 concussions since first concussion at 8 years old, Taking paroxetine and gabapentin for 12 years. Added L-Tryptophan and reduced paroxetine by half 3/2013
"Be Still and Know That I am God" Psalm 46:10