Well most doctors will not prescribe it, but i've heard good things about phenelzine, an irreversible monoamine oxidase inhibitor, especially for social anxiety disorder in particular. I think the old irreversible MAOIs have been forgotten, and risks overstated, so it will be near impossible to get it. You could also try and ask for pregabalin, and if that's somehow too much then perhaps you can try and ask for hydroxyzine, but it may not be the most effective. Im guessing you know about benzos already so these are some alternatives.