If bub is fighting sleeps for an hour then something's not right. Either bub is hungry or over or under tired.
What routines and tips did the sleep school have in place and are you following them at home? It might not be obvious at the time however missing one or two of the routine steps can throw sleep time out the window.
I agree with Holly - you need to make getting help for your anxiety the nr 1 priority (yes even above bub sleeping). You need to set yourself up for success instead of failure. Having a new bub with anxiety is bloody hard - a bit like trying to race in the Grand Prix with a Toyota Corolla - you might have the best intentions but it ain't gonna work unless you get help.