Yep... get used to it. This is one of the prime differences between industry and consulting. You often won't get much guidance or support and its up to you to figure it out. Right now I'd guess your brain is screaming out for some comforting words but trust me they aren't coming.If you really can't cope with this you need to get someone to listen to you. Screwing up a relationship with a client will not win you any friends and I'm sure your firm wouldn't want it that way anyway. Swallow what's left of your pride and tell your project manager that the project is way off the rails and you need to sit with him and sort out a way forward. If he doesn't listen go to your line manager and have the same conversation and point out that you will need some support through the early part of your career. BTW, you are just a money making machine, what else were you hoping for.