Hi Joe.
I'm not a doctor, but it looks like you are taking it in hand and getting on with life. So kudos to you!
A job interview is really stressful, and if you're not happy with it, then it's normal to feel down about it. Perhaps what you could use are some tricks to help you through times like that?
I have a relative who stuttered terribly as a child. He dreamed up tricks to be able to read his material, always having a written prompt to cover whatever he wanted to discuss. When he had to do a presentation to his high school class on volcanoes, he did it from the back of the class, projecting magazine pictures on a screen in the front of the room. He read his material from a prepared text. He got the highest mark, by the way, to our family's delight. No one noticed if he stuttered or not. He later became a successful newscaster, and then found it fun to produce the newscast.
Is this the kind of thing that's on your mind?