"How do you survive a relationship with a control freak gambler who blames every problem with money on me?"
There is little doubt gambling is an addiction. I worked for a gambling helpline while I was training to be a therapist. Here I heard firsthand the terrible effects and destruction uncontrollable compulsions to gamble inflict on people and their loved ones.
One of the things I heard time and time again was the way partners were often shocked at the extent of the problem, and that it had been hidden from them for so long. It isn't obvious a person has a gambling problem, they aren't intoxicated or hungover. It's one of the easiest addictions to hide.
People struggling with an addiction also hide from themselves. Gambling is like every other addiction in that people who are suffering are generally in denial about both the extent of their compulsions and their financial losses. Unique to gambling is also the idea that the next "big win" is just around the corner.
Sadly, what I take from your question is that this is someone deep in denial about their gambling and aiming their anger about the financial situation at you: either because it prevents their further gambling or protects them from the full impact of their addiction.