When you called neuro, did you make a point of stressing that OH is getting worse? Sometimes that can get action out of them. If that fails, call OH's GP and explain to them that he's getting worse, you've rung his neuro specialist who says that they are booked up until whenever snd you don't know what to do for the best. S/he might suggest you go to the surgery with him or the Dr may write to the neuro dept and see what they can do.