Hiall…...I have a couple of phobias...and, one or two that I came to grips with...
I don't happen to have one , specifically, from a "toxic relationship".
Yes, I think a phobia can result from a specific experience.....But, I would like to say that phobias and other anxiety disorders are the most common conditions on the globe...actually, even more common than depression...(who knew?)….
The best news is that it is highly treatable....IF, treated by those who are skilled and know what they are doing...
My best suggestion would be to consult a therapist who specializes in treating anxiety disorders and has experience in doin.g so.
It is best to trust the skilled and experienced therapists, rather than go with pre-conceived ideas. Work with the therapists.
A rule of thumb is...the sooner anxiety disorders are treated,,,the better, and easier it is. Over time, a person with a specific fear may get into the trap of avoiding ….because they actually become fearful of the fear itself....
Don't let that happen...see an expert...