His Blinding anger is ruining us

Hi, my partner was diagnosed with ADHD and was on medication and seeking help before I met him. He changed jobs during our relationship and chose to come off the meds as he was no longer covered with private health insurance.

We now have terrible rows. He goes from 0-100 in the space of a few seconds. Then he is like a dog with a bone. He won’t stop ranting. It’s awful. He’s not very good at empathising either or reflecting. 

The reason I’m still here is because he is incredibly lovely. He has changed so much over our time together in a good way. 

I hit crisis point over Christmas. I am ready to leave. He is going to arrange Cbt as soon as he can and look at going back on the meds. 

Will these measures help his anger? Or are we doomed?