I'm looking to get some additional practice from another person. However, given my relationship with my "instructor", that isn't an option. I'm hoping you can read between the lines here.
It's an option. Maybe it comes with costs you have decided you do not want to pay, but does it really, and have you really, consciously, rationally evaluated that? Ok, the way I'm asking that suggests I suspect the answer may be "no", but that's just based on general life experience, and the hint provided by the contradiction between your first sentence and your second. I can't speak to your particular situation, however much reading I do between the faint lines you've sketched.
But the bottom line is, if your "instructor" sucks at instructing, then one way or another you need to drop them.
I've been trying to learn how to drive and unfortunately I suck at it. Some combination of a stressful teacher and hyperfocusing have made it very difficult to learn. My biggest problem is with the multitasking aspect. Remembering to put on the turn signal while stopping and and checking my speed and watching out for other cars, etc. It's difficult for me, I forget or miss things. One thing I was considering may possibly help is using dual n-back to boost my working memory. Does anyone have any thoughts on the likely effectiveness of this?