Willow - hang in there. The sleep place may have some answers for you, its worth it to try anything if you are suffering so terribly. Bub may be in a non sleep cycle and is soooooo overtired that sleep is hard for him to find too. I am not an advocate of controlled crying or anything but hopefully the sleep school has some strategies other than letting him cry that can help. Also keep in mind it may get worse before it gets better. You may spend a couple of hideous nights resettling and resettling but then he will "get it".
All the best from us for Thursday.