I'm sorry to hear you had to break with your agent, Spikeman, but wish you better luck going forward!
And same to you, Raggycat! I had a similar situation with my first agent before I was published, and it was not fun at all. I've heard of this happening to so many writers, many of whom later found an agent who loved the work the other agent didn't love, and sold it. There are no guarantees, of course, but persistence can pay off. (I'm telling myself that, too, because I'm in a not-so-pleasant waiting scenario right now.)
I'm rereading this 19th-century novel called
New Grub Street that should have been called
The Woes of Writers, because that's what it's about. Basically everything awful that can happen to someone who tries to make a living from literature. I just read a scene where an author finishes his ms. (handwritten, mind you, one copy) and goes for a walk only to return and find his apartment house in flames. He dashes upstairs, through the smoke, past the prone body of the drunkard who caused the fire, straight to his ms. Then he heroically escapes via the roof, rolling his ms. in a coat and tossing it over. The next day he sends his smoky, charred, still-readable ms. to a publisher, hoping for an advance large enough to save him from starvation. Yep, reading this definitely makes me feel better about being a writer in 2018.