It is really not possible to accurately self-diagnose cognitive deficits. There are many causes, including anxiety, OCD (a form of anxiety), stress, school work load, diet, blood sugar levels, thyroid or other hormone imbalances, plus the issues due to injuries.

If you were symptom free from mid August to the end of October, what were you complaining about for the past few weeks?

It sounds to me like you need to slow down and take life a bit slower. Learn to let go of the little details.

btw, What doses of which B's are you taking? How about the other things like Omega 3, and other beneficial supplements.

Do you have access to a Neuro Psychological Assessment to properly quantify your symptoms? Most use an NPA to validate symptoms.