Man, everyone is saying they were angry at your old therapist for you, but it just made me want to cry on your behalf. To have someone with whom you have to be so vulnerable with turn on you like that is unimaginable.
We don't know what a large fraction of our genome is exactly supposed to DO. Sometimes it does nothing; a large genome is no guarantee of the complexity of the organism. The humble potato has a larger genome (number of base pairs in its DNA sequence) than humans do, and yet it just kind of sits there and... potates.