Being fucked in the head is not enough to get off on an insanity plea.
There is an old joke, "Does the defendant know the difference between a judge and a grapefruit? if so, he is fit to stand trial"
Insanity pleas have extremely high bars to meet, people with skitzophrenia, bipolar disorder, autism, meth-fried brains, and other serious psych disorders go to prison all the time. Do you know what you were doing is wrong? That is the only question that matters.
Insanity is out of the question, even for chris.