Well done mate. Its a brave step but sometimes the only way to avoid getting stuck in the mire of a more and more stressful position.
I did the same about 3 weeks ago. After over 2 years of broken promises, no follow up etc by my employer, it came to a head and I quit on the spot, cleared out my stuff on the spot, and left the building.
My fiancee knew i was deeply unhappy, and had suffered because it was a huge risk to leave with no job. So as i drove out of the car park, I was filled with anguish on what she would say, and what the future may hold. She was very supportive and assured me we would cope.
Aftet two weeks off, i started a new job last week with more responsibility, better pay, and a good team already in place. Fonancially its a struggle this month, but we will cope.
I looked at that how much worse could anothet job be than the one i already hated? Am loving it so far amd it feels great.
As othet have said, the first night was the hardest (hardly slept) but then the sense of relief was like a wave of euphoria.
Good luck and think positive.