oh, don't panic, sorry you are frustrated. I am not an expert but maybe someone else can suggest something. It seems a shame to waste all that fabric. What pattern are you doing? Maybe someone here can offer you a suggestion?
Can you take your 1 1/2 strips and redo them as 1 1/4 strips? not sure how much is completed. Hopefully someone can help you salvage all your work. Keep a positive outlook, it will turn out for good.
=)