Andrea,
I am in the exact same position as you are right now but I don't get clear headed when I correct my bite. My bio dentist never said anything about a correct bite helping my spaciness.
I can barely get a spoon in my mouth right now with my TMJ and no dentist will touch me to take the mercury out until the TMJ is addressed.
I had braces at 15 as well and this is where my clicking and popping all started. I remember distinctly the orthodontist saying my bite was perfect before the braces and now my jaw is all messed up.
I am also allergic to nickel and this all started within the same time frame as the braces were put on. I can't wear any jewlery.

I'd get a second opinion as well and ask about getting a splint or orthosis you could wear, this can help immensly.

Hope all works out well for you